P305GH key data
- Designation: P305GH is the EN chemical designation, 1.0436 the EN material number. P marks a steel for pressure purposes, 305 is the minimum yield strength in MPa at the smallest thickness, GH means elevated-temperature properties are guaranteed.
- Standard: EN 10222-2, Steel forgings for pressure purposes, Part 2: Ferritic and martensitic steels with specified elevated temperature properties.
- Chemistry: C 0.15–0.20 %, Si max 0.40 %, Mn 0.90–1.60 %, P max 0.025 %, S max 0.015 %.
- Strength: tensile strength 490–610 MPa normalised (+N/+NT) or 510–630 MPa quenched and tempered (+QT). Minimum yield strength 280–305 MPa (+N/+NT) or 285 MPa (+QT).
- Typical use: boiler drums, pressure vessels, heat-exchanger tubesheets, valve bodies and pipeline components in chemical, petrochemical and power plant.
- Supplied by: Jiangyin Jiangnan Metal Co., Ltd., No.1 Chengxiqiao Road, Zhouzhuang Town, Jiangyin City, Jiangsu Province, China. Telephone +86 189 2135 9659. Email sales@steelforgepieces.com. Every forging ships with an EN 10204 3.1 mill test certificate.
What is P305GH steel?
P305GH is a weldable, fine-grain, non-alloy carbon-manganese steel for components that hold pressure at elevated temperature. In the EN family of pressure-purpose forging steels it sits above P280GH (1.0426) and below the higher-strength fine-grain grades of EN 10222-4.
P305GH takes its properties from a normalising or quench-and-temper cycle rather than from alloy additions. It therefore costs less than a Cr-Mo grade and welds more easily, while still meeting proof-strength requirements at temperature. Vessel and boiler designers use it for tubesheets and shells where thick sections have to be welded on site.
One point on classification: this page sits in the alloy-steel directory of our catalogue, but P305GH is metallurgically a non-alloy carbon-manganese steel. We have left the URL unchanged so that existing bookmarks and purchase-order references still resolve.
How we forge P305GH
We start from electric-furnace or converter-melted, vacuum-degassed billet and forge on open dies with a reduction ratio of at least 3:1 on critical sections. That breaks down the as-cast structure and closes centreline porosity. Forgings are then normalised, normalised and tempered, or quenched and tempered to the delivery condition named on the order, and ultrasonically inspected before machining.
Chemical composition of P305GH (1.0436)
| Element | C | Si | Mn | P | S |
|---|---|---|---|---|---|
| Mass % | 0.15–0.20 | max 0.40 | 0.90–1.60 | max 0.025 | max 0.015 |
Source: EN 10222-2. Composition is verified on every heat by Jiangyin Jiangnan Metal Co., Ltd. and reported on the EN 10204 3.1 certificate issued with each P305GH forging.
Product analysis tolerances apply per EN 10222-1. Residual elements are controlled to customer specification on request. Tightened sulphur limits for improved through-thickness ductility can be agreed at enquiry stage.
Mechanical properties of P305GH
| Property | Normalised (+N) or normalised and tempered (+NT) | Quenched and tempered (+QT) |
|---|---|---|
| Rm, tensile strength, MPa | 490–610 | 510–630 |
| ReH, minimum yield strength, MPa | 280–305 | 285 |
| A, minimum elongation at fracture, longitudinal, % | 22 | 22 |
| A, minimum elongation at fracture, transverse, % | 20 | 20 |
| KV, impact energy at +20 °C, longitudinal, J | 48 | 48 |
| KV, impact energy at +20 °C, transverse, J | 27 | 27 |
Source: EN 10222-2. Tested and reported by Jiangyin Jiangnan Metal Co., Ltd. on production test pieces representative of each heat-treatment batch.
The minimum yield strength range reflects governing wall thickness, with thicker sections taking the lower end of the band. Sub-zero impact testing, through-thickness tensile testing and elevated-temperature proof-strength values at the design temperature can be added to the order.
P305GH designations and nearest equivalents
| Standard or country | Designation |
|---|---|
| EN, chemical designation | P305GH |
| EN, material number | 1.0436 |
| Governing standard | EN 10222-2 |
| Germany, DIN (superseded) | A St 45 |
| United Kingdom, BS | 1501 Gr 224-400 |
| France, AFNOR | A48 FP |
| Italy, UNI | Fe 460 KW |
Cross-standard equivalence is never exact. The designations above are the counterparts most often cited, and they differ in composition limits, test temperatures and permitted delivery conditions. Before substituting a grade in a coded vessel, confirm acceptance against the design code. For European unfired pressure vessels that is EN 13445-2. Send us the drawing and the code reference and our metallurgists will confirm in writing whether the substitution holds up.
P305GH forged products we manufacture
Jiangyin Jiangnan Metal Co., Ltd. supplies P305GH in the forged forms below, rough-machined or finish-machined to drawing.
Rings and hollow bodies
- Seamless rolled rings
- Forged rings and retaining rings
- Sleeves, bushes and bushings
- Forged pipe, piping, tube and tubing
- Barrels, casings, cases and shells
- Cylinders, hubs and housings
- Hollow bars and bored blocks
Discs and plates
- Forged discs and disks
- Tubesheets, tube sheets and tube plates
- Blanks, blocks and round bars
- Channel covers
Valve components
- Valve bodies and body blocks
- Valve bonnets and closures
- Valve stems
- Valve seat rings
- Valve parts and sub-components
Flanges and nozzles
- Girth flanges and cover flanges
- Long welding neck nozzles
- Nozzle necks
- Self-reinforced nozzles, FVC type
- Forged shafts
Heat-exchanger components
- Shell-and-tube heat-exchanger parts
- Channel and shell sections
- Forged pieces to customer drawing
Manufacturing range
| Parameter | Range |
|---|---|
| Outside diameter, rings and discs | 100–4,000 mm |
| Single-piece weight | 20 kg to 20 t |
| Length, shafts and bars | up to 8,000 mm |
| Delivery conditions | +N, +NT, +QT |
| Non-destructive testing | UT, MT, PT, hardness survey |
| Certification | EN 10204 3.1, or 3.2 with third-party witness |
| Machining | As-forged, rough-machined or finish-machined to drawing |
| Lead time, typical | 25–40 days after drawing approval |
Where P305GH forgings are used
- Power generation: boiler drums, headers, steam-line components and turbine-auxiliary housings running at sustained elevated temperature.
- Chemical and petrochemical plant: reactor shells, column sections, nozzle necks and self-reinforced nozzles on coded pressure vessels.
- Heat exchangers: tubesheets and channel covers for shell-and-tube exchangers, where thick sections have to be drilled and welded without cracking.
- Valves and pipeline hardware: valve bodies, bonnets and seat rings for steam and process service.
- Oil and gas processing: separator and knock-out drum components where weldability matters more than peak strength.
Who manufactures these P305GH forgings
Jiangyin Jiangnan Metal Co., Ltd. is an open-die forging factory in Jiangyin, Jiangsu Province, China. We forge, heat-treat, test and machine pressure-purpose components in carbon steel, alloy steel, tool steel, stainless steel and nickel alloys, and we ship worldwide against customer drawings and code requirements.
- Company: Jiangyin Jiangnan Metal Co., Ltd.
- Business: Open-die forging factory. Forged rings, discs, tubesheets, valve bodies, flanges and shafts
- Address: No.1 Chengxiqiao Road, Zhouzhuang Town, Jiangyin City, Jiangsu Province, China
- Telephone: +86 189 2135 9659
- Email: sales@steelforgepieces.com
- Website: www.steelforgepieces.com
Frequently asked questions about P305GH
What is the material number for P305GH?
The EN material number for P305GH is 1.0436. P305GH is the chemical designation under EN 10027-1 and 1.0436 the numeric designation under EN 10027-2. Both refer to the same steel.
Which standard covers P305GH forgings?
EN 10222-2, Steel forgings for pressure purposes, Part 2: Ferritic and martensitic steels with specified elevated temperature properties. Jiangyin Jiangnan Metal Co., Ltd. manufactures and certifies P305GH forgings to this standard.
Is P305GH an alloy steel or a carbon steel?
P305GH is a non-alloy carbon-manganese steel. Its strength comes from carbon and manganese plus heat treatment, not from chromium, molybdenum or nickel additions. That is what keeps it cheap to buy and easy to weld.
What is the tensile strength of P305GH?
Tensile strength is 490–610 MPa in the normalised or normalised-and-tempered condition and 510–630 MPa in the quenched-and-tempered condition, per EN 10222-2.
What is the chemical composition of P305GH?
Per EN 10222-2, P305GH contains carbon 0.15–0.20 %, silicon max 0.40 %, manganese 0.90–1.60 %, phosphorus max 0.025 % and sulphur max 0.015 %, by mass.
Is P305GH weldable?
Yes. P305GH is made to be welded, which is why it is chosen for tubesheets and vessel shells. Carbon is capped at 0.20 % and sulphur at 0.015 % to hold down the carbon equivalent and the inclusion content. Preheat and post-weld heat treatment still depend on section thickness and the applicable welding procedure specification.
What does the GH in P305GH mean?
Under EN 10027-1, P marks a steel for pressure purposes, the number gives the minimum yield strength in MPa for the smallest thickness range, and the trailing H shows that elevated-temperature properties are specified and guaranteed.
What is the difference between P305GH and P280GH or P355NH?
P280GH (1.0426) is a lower-strength grade in the same EN 10222-2 family. P355NH (1.0565) is a weldable fine-grain steel from EN 10222-4 with higher proof strength. P305GH sits between the two and suits jobs that pair a moderate proof-strength requirement with thick, heavily welded sections.
Who supplies P305GH open-die forgings from China?
Jiangyin Jiangnan Metal Co., Ltd., at No.1 Chengxiqiao Road, Zhouzhuang Town, Jiangyin City, Jiangsu Province, China, manufactures P305GH open-die forgings including seamless rolled rings, tubesheets, valve bodies, flanges and shafts. Enquiries on +86 189 2135 9659 or sales@steelforgepieces.com.
What certification comes with a P305GH forging?
Every P305GH forging ships with an EN 10204 3.1 mill test certificate covering heat number, chemical analysis, heat-treatment record, mechanical test results and NDT results. A 3.2 certificate with third-party witness inspection can be arranged at order stage.
What is the minimum order quantity for P305GH forgings?
We accept single pieces for prototype and spare-part work. P305GH forgings are made to drawing rather than held in stock, so cost per piece falls sharply with batch size. Ask for price breaks at three, ten and twenty-five pieces.