1.0460 (P250GH) Forged Steel Forging Parts | Professional China Manufacturer & Supplier

Product Overview

Jiangsu Liangyi Co.,Limitedis a professional ISO 9001:2015 certified manufacturer in China that makes 1.0460 (P250GH) open die forging parts and seamless rolled steel forged rings. The company has been in business since 1997 and has more than 25 years of experience in the industry. It exports to more than 50 countries in Europe, the Middle East, North America, Southeast Asia, and Oceania.

1.0460 (also known as P250GH) is a specialized hot-rolled weldable boiler steel designed for stable operation at elevated temperatures up to 450℃, fully compliant with EN 10273:2007 standard. It is the ideal material for critical pressure equipment components requiring excellent weldability, high pressure resistance, good impact toughness and long-term fatigue performance. P250GH grade material is typically supplied in the normalized condition, with complete mill test certificate (MTC) EN 10204 3.1/3.2 available for all batches.

The designation 1.0460 is the European material number, while P250GH is the symbolic steel name: "P" for pressure service, "250" for minimum yield strength in MPa, and "GH" indicating elevated-temperature (Hochtemperatur) suitability. Both terms refer to the identical steel grade under EN 10273:2007.

Explore our full range of forged steel products and learn more about our advanced forging equipment to support your custom project requirements.

Why Global Buyers Choose Jiangsu Liangyi for 1.0460 (P250GH) Forgings

After 25+ years of supplying EN 10273 P250GH forged parts to engineering companies, EPC contractors and OEM manufacturers across 50+ countries, we have identified the six factors that matter most to serious buyers — and built our entire operation around them:

1. Integrated Steelmaking-to-Machining Control — No Subcontracting

Many forging suppliers in China source their billets from external steel mills and have no control over the actual chemical composition or inclusion content of the incoming raw material. We operate differently. Our P250GH material is sourced from a qualified steel mill partner whose production process we audit annually, and every heat of steel is re-verified by our own spectrometer before entering the forge. This means we catch problems at the billet stage, not after forging — a distinction that significantly reduces rejection rates and delivery delays. For orders requiring EN 10204 3.2 third-party certification, our process documentation starts from heat number at the furnace, not from the finished bar.

2. Forging Ratio Control for Dense, Defect-Free Microstructure

P250GH is a medium-carbon steel with relatively tight compositional tolerances. The quality of the finished forging depends heavily on achieving a sufficient forging ratio to break down the as-cast dendritic structure and close internal porosity. Our metallurgical engineers specify a minimum forging ratio of 4:1 for all P250GH open-die forgings, and 3:1 for seamless rolled rings, based on the diameter-to-wall ratio of the final component. For large forgings above 3 tons, we perform intermediate reheats to maintain workability and prevent cold shuts. These process parameters are documented in our Forging Procedure Specification (FPS) for each order and are available for customer review.

3. In-House Normalized Heat Treatment with Full Curve Recording

Normalization is not simply "heat and air cool." For P250GH, achieving the correct final grain size (ASTM grain size 6–8 is our internal target) requires precise control of the austenitizing temperature (880–920°C), holding time calculated by section thickness (typically 1 minute per mm of maximum cross-section, minimum 30 minutes), and controlled cooling rate. Our 21 gas-fired furnaces are equipped with multi-zone temperature control and computerized data logging that records furnace temperature, part surface temperature (via contact thermocouple for qualification pieces), and cooling conditions at 1-minute intervals. The resulting temperature-time chart is issued with every batch as part of the EN 10204 3.1 MTC and is available in digital format (PDF/Excel) for your engineering review.

4. Dimensional Tolerance Capability for Near-Net-Shape Forgings

One area where forging quality directly affects your procurement cost is the amount of machining allowance built into the forging drawing. Over-generous allowances mean you are paying to machine away expensive forged material. Our 25+ years of tooling experience with P250GH open-die forgings allows us to work to tighter as-forged tolerances than most competitors: ±3mm on diameters up to 500mm, ±5mm on diameters 500–1000mm, and ±8mm on diameters above 1000mm, with straightness within 1mm/m. For seamless rolled rings, we typically achieve ±2mm on OD and ±3mm on height as-rolled. These tighter starting tolerances reduce your machining cycle time and reduce material scrap.

5. Third-Party Inspection Fully Supported — Including Resident Inspectors

We work regularly with all major third-party inspection agencies, including Bureau Veritas (BV), Lloyd's Register (LR), SGS, Intertek, TÜV Rheinland, DNV, and customer-appointed resident inspectors. We have a separate third-party inspection room in our factory that has direct sightlines to our UT/MT inspection benches, hardness testing station, and dimension inspection table. We know what documents are needed for European PED (Pressure Equipment Directive) projects, including Annex I essential safety requirements and the conformity assessment procedure for pressure equipment. At the quotation stage, we can talk about and agree on the inspection hold points (H) and witness points (W) in your Inspection and Test Plan (ITP).

6. Lead Time Commitment and Transparent Progress Tracking

It takes 15 to 30 working days from the time you place your order to get normal 1.0460 (P250GH) forged parts. The real lead time depends on the drawings of the parts and the heat treatment needs. For emergency orders of up to 5 tons with simple shapes, the lead time is 7 to 10 business days. When you place an order, we send you a production schedule and then give you updates at key points along the way, such as when we receive the billet, finish forging, finish heat treatment, and sign off on the final inspection. Our export team takes care of all the shipping paperwork, such as the commercial invoice, packing list, EN 10204 MTC, certificate of origin, and fumigation certificate. We send documents by DHL or FedEx and cargo by sea freight from Ningbo or Shanghai port.

1.0460 (P250GH) Forged Product Forms — Capabilities & Technical Notes

Our maximum single-piece forging weight is 35 tons, minimum is 30 kg, and annual output capacity is 120,000 tons. Below is a technical breakdown of each product form we manufacture in P250GH, including typical dimensional ranges and the engineering considerations specific to each form:

Open-Die Forged Bars, Blocks & Discs

Round bars are our highest-volume P250GH product. We produce them from 80mm diameter up to 1,200mm diameter, in lengths up to 6,000mm as-forged (longer sections are available in multiple-piece joined sets). Square and rectangular bars are produced for valve body blanks, manifold blocks, and structural pressure parts. Our forging presses provide up to 6,300 tonnes of compressive force, guaranteeing adequate plastic deformation even on large cross-sections. All bars are produced with a defined forging reduction ratio and forged from both ends to guarantee consistent mechanical properties along the full length — an important requirement for pressure equipment parts where end-to-end consistency is tested by EN 10273.

Forged discs and plates for tube sheets, cover plates, and blind flanges are produced with a minimum forging ratio of 3:1 on the thickness direction. We can pre-drill the tube hole pattern as-forged for tube sheet applications to make machining easier. For all tube sheet orders, we also provide 100% UT per EN 10228-3 Class 3.

Seamless Rolled Rings & Forged Flanges

We can make seamless rolled rings in P250GH with outside diameters (OD) ranging from 200mm to 5,000mm, wall thicknesses ranging from 30mm to 600mm, and heights up to 800mm using our 1m and 5m ring rolling machines. Ring rolling is the preferred manufacturing method for flanges, pressure vessel nozzle reinforcement rings, and large-diameter pipe fittings because it produces a circumferentially oriented grain flow that maximizes hoop strength and fatigue resistance — properties that are not achievable with fabricated (welded) alternatives.

We produce all standard flange types in P250GH: weld neck (WN), slip-on (SO), socket weld (SW), blind (BL), lap joint (LJ), threaded (TH), and orifice flanges, to ASME B16.5 (Class 150–2500), EN 1092-1 (PN6–PN420), and DIN standards. Swivel ring flanges — a specialty item for offshore pipeline connections — are also produced in P250GH to API 6A and customer-specific drawings.

Hollow Forgings: Shells, Sleeves, Housings & Hollow Bars

Hollow forgings (also called forged hollow bars or forged thick-walled cylinders) are one of the most technically demanding product forms. We use a punch-and-draw process on our hydraulic presses to produce P250GH hollow forgings with bore diameters from 100mm to 800mm and wall thicknesses from 50mm to 400mm. The advantage over machining from solid bar is that the grain flow follows the cylindrical contour, improving fatigue life and impact resistance in the circumferential and axial directions — particularly important for pressure vessel shells, reactor vessels, and pump barrels operating under cyclic pressure loads.

Forged sleeves and bushes for bearing applications are produced with tighter as-forged bore tolerances (H11) and are often supplied with an internal bore ground or honed to the customer's final dimension, eliminating the need for an intermediate machining operation at your facility.

Forged Fittings: Wyes, Piggable Wyes, Swept Branches & Saddles

Pipeline fitting forgings in P250GH are produced to MSS SP-75, ASME B16.9, or customer-specific standards. Our specialty is large-bore high-pressure fittings that are impractical to manufacture by welding or casting: piggable wye fittings (allowing pig passage through the branch), swept branch tees with a smooth radius at the branch takeoff (reducing pressure drop and erosion at the junction), and reinforced saddles for branch connections on large-diameter main pipes.

Piggable wye fittings in P250GH are produced in sizes from 4" to 48" nominal bore, with the main bore and branch bore matching your pipeline's pig barrel dimensions to within ±2mm. We manufacture the fitting as a single integral forging — not a machined block with welded branches — which eliminates the heat-affected zones and weld seams that are the most common failure point in conventional fabricated wyes.

Valve Bodies, Bonnets, Pump Casings & Impellers

Forged valve bodies in P250GH are preferred over cast alternatives for high-pressure (ASME Class 900 and above) and high-temperature service because forgings eliminate the porosity, shrinkage cavities, and inclusion clusters that are inherent to the casting process. We supply forged valve bodies in gate, globe, ball, check, and control valve configurations to API 600, API 602, BS 1414, and EN 12516, with pressure-temperature ratings fully conforming to ASME B16.34.

Pump casings and impellers in P250GH are used in high-pressure boiler feed pumps, reactor coolant pumps, and process pumps for refinery and chemical plant service. We produce these with our 5-axis CNC machining centers to achieve surface finishes of Ra 1.6 μm on flow passages and Ra 0.8 μm on sealing faces, reducing hydraulic friction losses and ensuring reliable sealing in high-pressure service.

Industry Applications, Engineering Rationale & Global Project Case Studies

Project case studies below are based on representative completed projects. Customer names are kept confidential per standard commercial agreements. Specific quantities and specifications are provided for illustrative purposes and represent typical order scopes.

P250GH is not a general-purpose carbon steel. Its specific combination of controlled carbon content (0.18–0.23%), Aluminum-killed grain refinement (Al 0.015–0.05%), and low sulfur (max 0.015%) makes it particularly well-suited for applications requiring all of the following simultaneously: weldability without mandatory post-weld heat treatment (PWHT) in most cases, stable creep resistance at up to 450°C, reliable room-temperature impact toughness (≥47J at 20°C), and full traceability per EN 10204. Below are the primary industries we serve, with engineering context and real project experience.

Additional application areas for 1.0460 (P250GH) forgings from Jiangsu Liangyi include: chemical reactor vessels and autoclaves (Zhejiang and Jiangsu process industry cluster); subsea pipeline manifolds and jumpers (Asia-Pacific offshore oil field development); high-pressure hydrogen compression equipment (P250GH's low carbon equivalent provides excellent compatibility with high-pressure H₂ environments at ASME Class 1500 and below); and geothermal wellhead equipment and Christmas trees (where thermal spray or cathodic protection is applied post-machining for external corrosion control).

Material Specifications, Engineering Properties & Compliance Standards

Applicable Production & Design Standards

Our 1.0460 (P250GH) forged steel parts are manufactured and certified in compliance with the following standards. Where a customer specification references a standard not listed here, we will review it at the quotation stage and confirm compliance or identify any deviations:

Steelmaking Route & Metallurgical Quality Controls

The quality of a P250GH forging is determined as much by the steelmaking route as by the forging process itself. The UT testability and fatigue life of the finished forging are all affected directly by inclusions, segregation, and residual hydrogen in the billet. Our approved method for making P250GH billets from steel includes the following steps, each with its own set of acceptance standards:

1. Primary melting: Electric Arc Furnace (EAF) or Basic Oxygen Furnace (BOF), with controlled charge composition to limit residual elements (Cu ≤0.25%, Sn ≤0.025%, As ≤0.025%, Sb ≤0.010%).
2. Ladle Refining Furnace (LRF): Fine-tuning the composition, desulfurizing to S ≤0.010% for pressure service grades, and optimizing the slag chemistry to control the shape of inclusions (for example, treating calcium to turn angular alumina inclusions into globular calcium-aluminate, which reduces UT signal scattering).
3. Vacuum Degassing (VD or VD/VOD): Hydrogen removal to <2 ppm (measured by Hydris on liquid steel), nitrogen control to <80 ppm, oxygen activity below 15 ppm. VD is standard for all forgings with section thickness above 200mm; mandatory for nuclear auxiliary applications.
4. Continuous casting (CC) or ingot casting: For forgings above 5 tons, ingot casting is preferred to avoid the central porosity and macro-segregation that are inherent to continuously cast large blooms. Our ingot weights range from 3 tons to 60 tons.
5. Incoming billet inspection: Every heat number is verified by our own optical emission spectrometer (OES) against the EN 10273 chemical composition limits before forging. Billet surface is inspected visually and by MT for seams, scabs, and laps.

Chemical Composition — EN 10273:2007 Requirements & Our Actual Practice

The chemical composition of 1.0460 (P250GH) forged steel is tightly specified in EN 10273:2007, Table 2. Our actual production heats consistently achieve the following ranges (both EN limits and our typical actual values are shown):

Carbon Equivalent & Weldability Analysis

The weldability of P250GH is one of its most valued engineering properties. The IIW carbon equivalent formula (CE_IIW = C + Mn/6 + (Cr+Mo+V)/5 + (Ni+Cu)/15) gives a typical value of 0.35–0.42 for standard P250GH compositions. The CET (carbon equivalent for cracking susceptibility) formula used in EN ISO 10225 (CET = C + (Mn+Mo)/10 + (Cr+Cu)/20 + Ni/40) gives a typical value of 0.22–0.28.

Based on these values and the EN ISO 10225 guidance, P250GH butt welds with combined thickness below 40mm generally require no preheat when heat input is above 1.0 kJ/mm. For section thickness above 40mm, or when heat input is below 1.0 kJ/mm, a minimum preheat of 50–100°C is recommended. This is significantly lower than alloy pressure steels like 16Mo3 (preheat 100–150°C) or 13CrMo4-5 (preheat 150–200°C), and is why P250GH is preferred for heat exchanger and boiler construction where weld joint productivity and post-weld PWHT avoidance are important economic drivers.

Mechanical Properties — Room Temperature (EN 10273:2007, Table 5)

The following room-temperature mechanical properties are guaranteed for all our 1.0460 (P250GH) forgings and verified on each batch by tensile testing (per EN ISO 6892-1) and Charpy V-notch impact testing (per EN ISO 148-1) on samples taken from the prolongation of the forging in the longitudinal direction:

Note: Reduction of area Z ≥50% is our internal additional requirement, beyond EN 10273 minimum, ensuring superior through-thickness ductility — particularly relevant for pressure vessel tube sheets where transverse loading occurs. This value is reported on our MTC.

Elevated-Temperature Mechanical Properties (EN 10273:2007, Annex A)

One of the defining features of P250GH that distinguishes it from structural carbon steels is its certified elevated-temperature strength. The following minimum proof strength values at elevated temperatures are specified in EN 10273 Annex A and are reportable on the MTC for pressure equipment applications where EN 13445 design calculations require elevated-temperature allowable stresses:

We can report elevated-temperature tensile properties on the MTC — either by direct testing (using an elevated-temperature tensile test machine) or by cross-referencing to the tabulated EN 10273 Annex A values, depending on your project specification requirements. For projects requiring direct elevated-temperature test reporting, please specify this in your inquiry so we can include the test cost in our quotation.

Hardness, Grain Size & Microstructure Requirements

In the normalized condition, P250GH typically exhibits a Brinell hardness of 120–160 HBW measured on the mid-radius of the forging cross-section. Our internal acceptance criterion for hardness uniformity across the cross-section is ΔHB ≤20 HBW between surface and center measurements, which indicates consistent normalization throughout the section thickness. Vickers micro-hardness mapping is performed on representative metallographic samples to verify the microstructure uniformity and the absence of hard martensitic or bainitic zones that could form if cooling was too rapid during normalization.

The target ASTM austenite grain size after normalization is ASTM 6–8 (mean grain diameter 22–44 μm), verified per ASTM E112 or EN ISO 643 on representative samples. This fine grain size is what gives P250GH its combination of good strength, toughness, and fatigue life — it is achieved through the combination of the Al-killed fine-grained steel chemistry and the controlled normalization temperature range (880–920°C), which is above Ac3 (approximately 855°C for P250GH) but not so high as to cause significant grain coarsening.

Production Capabilities, Process Sequence & Equipment List

Our 80,000 m² integrated manufacturing facility in Jiangyin, Jiangsu Province is specifically designed for large-section pressure equipment forgings. The facility operates as a vertically integrated production unit: billet heating, forging, ring rolling, heat treatment, NDT inspection, and CNC precision machining are all performed under one roof, with internal material handling by overhead cranes (capacity up to 100 tons) eliminating the inter-site transport delays and handling risks associated with multi-supplier production chains.

Step 1 — Billet Heating: Accurate Temperature Control Before Forging

Our 6 mobile hearth heating furnaces have individual loading capacities from 10 to 80 tons. Each furnace is equipped with a multi-zone temperature control system (PID controllers, ±5°C accuracy) and automatic atmosphere control to minimize decarburization of the billet surface. For P250GH billets, the standard heating sequence is: charge at furnace temperature ≤400°C, heat to 1,180–1,220°C at a controlled rate of ≤80°C/hour for billets above 500mm diameter (to prevent thermal shock), hold for a minimum of 1 hour per 100mm of maximum cross-section, verify uniformity by surface-to-core thermocouple differential ≤30°C before discharge to the press. This careful heating protocol makes sure that the billet is at a uniform hot-working temperature throughout its cross-section — an important requirement for achieving consistent forging reduction and eliminating the internal cracking risk that can occur when a billet is forged with a cold center.

Step 2 — Open-Die Forging: Press Selection, Reduction Ratio & Pass Sequence

Our hydraulic forging presses (2,000T, 4,000T, and 6,300T) are semi-automatic, with servo-hydraulic ram speed control that allows us to maintain a consistent strain rate during forging. Press selection for each P250GH component is based on the forging force calculation: for a 1,000mm diameter bar, the required forging force at the final pass (smallest cross-section) is typically 3,500–4,500 tons, depending on billet temperature and reduction rate — well within the capacity of our 4,000T press, which is our workhorse machine for mid-size P250GH bar forgings.

The forging pass sequence for a P250GH round bar typically involves: initial breakdown forging of the ingot on 4 flat faces to break down the as-cast structure and close center porosity; drawing-out to an intermediate octagonal cross-section; and final rotary forging on the press to achieve the target round diameter, with light reduction passes (5–8% per pass) at the final temperature to ensure a smooth surface and uniform grain refinement. Our forging manipulators (12–70 ton capacity, including rail-mounted manipulators for large forgings) provide positional control during each pass, guaranteeing straight forgings and consistent reduction ratio along the full length.

For forgings above 5 tons or with length-to-diameter ratio above 4:1, intermediate reheats are performed when the billet surface temperature drops below 900°C. Our furnace placement adjacent to the presses allows reheating in typically 30–45 minutes, minimizing scale formation and oxidation loss during the reheat cycle. Our Forging Procedure Specification (FPS) keeps track of the total number of heats (forging and reheating sequences) for each P250GH part. This information is also part of the manufacturing record.

Step 3 — Seamless Ring Rolling: Process Control for Uniform Ring Properties

Our 1m and 5m radial-axial ring rolling mills produce seamless rolled rings in P250GH from 200mm OD to 5,000mm OD. The ring rolling process begins with a punched and drawn preform (hollow forging) that is then placed on the mandrel of the ring rolling mill and rolled between the main roll and mandrel while the axial rolls control the ring height. The key process parameter in ring rolling is the feed rate: too fast and the ring develops oval distortion (ovality >1%); too slow and the temperature drops below the recrystallization temperature and the ring develops a mixed grain structure. Our rolling programs specify feed rate as a function of ring OD, wall thickness, and current ring temperature (monitored by non-contact pyrometer) to maintain ovality within ±0.5% of OD throughout the rolling sequence.

The primary quality advantage of seamless rolled rings over alternative methods (fabricated rings from plate, or rough-machined from solid bar) is the circumferential grain flow orientation. In a seamless rolled ring, the crystal grains are elongated in the circumferential direction — the direction of maximum hoop stress in a pressure vessel or flanged nozzle under internal pressure loading. This alignment increases fatigue crack propagation resistance in the critical hoop stress direction by 20–35% compared to a machined ring from bar, where the grain flow is axial. For pressure equipment applications where EN 13445 requires fatigue analysis, this difference in grain flow can allow a reduction in the required section thickness, reducing component weight and material cost.

Step 4 — Normalization Heat Treatment: Process Parameters & Verification

According to EN 10273:2007, normalization is the standard delivery heat treatment condition for P250GH (1.0460). We have a strict process for normalizing P250GH that is specific to each furnace-forging size combination:

1. Loading: Forgings are loaded on ceramic or steel spacers to ensure adequate gas circulation on all surfaces. Maximum stack height is limited to 1.5 × forging cross-section diameter to prevent shadow effects on lower pieces.
2. Heating: Furnace temperature is raised to 900°C ± 15°C (the austenitizing temperature range for P250GH). Heating rate is controlled to ≤80°C/hour for sections above 200mm to prevent thermal stress cracking.
3. Soaking: Holding time after the furnace thermocouple reaches the target temperature is calculated as 1 minute per mm of maximum cross-section thickness, with a minimum of 30 minutes. This guarantees complete austenitization throughout the section, verified by metallographic sampling from the center of qualification test forgings during process qualification.
4. Cooling: Forgings are discharged from the furnace and cooled in still air at ambient temperature (typically 15–30°C). For very large or complex shape forgings, controlled air-blast cooling at 5–8°C/minute can be applied to reduce cooling time while avoiding thermal stress. Water quenching is not used for normalization of P250GH.
5. Verification: Tensile test bars and Charpy V-notch test bars are machined from the prolongation of each heat treatment batch and tested before the batch is approved for release. Hardness is verified at 5 locations per forging (2 surfaces, 2 quarter-radii, 1 center where accessible) by Brinell hardness tester.

Our 21 gas-fired heat treatment furnaces (plus 1 electric furnace) provide a combined effective chamber volume of over 4,000 m³ and a maximum single piece capacity of 80 tons and 16m length. All furnaces are connected to our centralized furnace data management system (FDMS) that records furnace temperature, part temperature (where thermocouple contact is used), atmosphere conditions, and heating/cooling rates at 1-minute intervals. This complete heat treatment time-temperature record is stored digitally and is issued as part of the EN 10204 3.1/3.2 certification package for each batch.

Step 5 — Precision CNC Machining: Capabilities & Tolerances

We have a full range of CNC machines in our machining workshop that let us make finished or semi-finished P250GH forged parts to your exact size without having to hire outside help for machining:

Equipment Type	Key Specifications	Typical Applications on P250GH
CNC Heavy Turning Lathes	Max swing Ø4,000mm, max length 16,000mm, max weight 80T	OD/ID turning of large rings, pressure vessel shells, shaft blanks
5-Axis CNC Machining Centers	Working envelope 2,500 × 2,000 × 1,200mm	Complex valve body cavities, pump impeller profiles, irregular forgings
CNC Boring & Milling Machines	Table size 4,000 × 2,000mm, spindle power 75kW	Tube sheet hole patterns, flange bolt circle drilling, manifold bore
Vertical CNC Lathes (VTL)	Table diameter up to Ø6,300mm	Large ring facing, channel flange facing, tube sheet facing
CNC Grinding	ID grinding to Ra 0.4μm, OD grinding to Ra 0.8μm	Valve seat surfaces, shaft journals, precision bore finishing

Our standard dimensional tolerances for machined P250GH forgings are: diameter tolerances to IT8 (e.g., ±0.027mm on a 100mm diameter bore), surface finish Ra 1.6μm on general machined surfaces, Ra 0.8μm on sealing faces (RTJ, RF flanges), and Ra 0.4μm on precision bore and journal surfaces. Tighter tolerances to IT7 or surface finish Ra 0.2μm are achievable for specific critical surfaces and are quoted on a case-by-case basis.