EN 10222-2 · Non-Alloy Steel
1.0426 (P280GH) Forged Steel
Carbon-manganese steel for pressure-bearing forgings — made by Jiangyin Jiangnan Metal Co., Ltd.
Material Overview
1.0426 is the Werkstoff number (EN numeric designation) for P280GH, a non-alloy carbon-manganese steel covered by EN 10222-2 — Steel Forgings for Pressure Purposes, Part 2: Ferritic and Martensitic Steels with Specified Elevated Temperature Properties.
This grade is widely used in boilers, pressure vessels, heat exchangers, and high-temperature piping. The "280" in the name refers to its minimum yield strength of 280 MPa. The "GH" suffix indicates it is rated for service at higher temperatures.
Because the carbon content is capped at 0.20%, the carbon equivalent (CEV) stays below 0.43. In practice, this means P280GH welds well in the field and does not normally require post-weld heat treatment on thinner sections.
Jiangyin Jiangnan Metal Co., Ltd. produces custom open-die forgings in 1.0426 (P280GH) ranging from 30 kg to 30 tons. Our product range covers seamless rolled rings, forged flanges, discs, tube sheets, shafts, valve bodies, and shell components. All forgings ship with EN 10204 3.1 or 3.2 mill test certificates and can be dual-certified to match your project specs.
Chemical Composition
The table below shows the heat-analysis limits for P280GH (1.0426) per EN 10222-2:2000. Low carbon and sulfur maxima are the main reason this grade welds as well as it does.
Chemical Composition of P280GH (1.0426) — EN 10222-2 (wt.%)
| C |
Si |
Mn |
P |
S |
| 0.08 – 0.20 |
≤ 0.40 |
0.90 – 1.50 |
≤ 0.025 |
≤ 0.015 |
Carbon is the primary strengthening element here, forming pearlite during cooling. Manganese at 0.90–1.50% adds solid-solution strength and helps with hot working. Silicon works as a deoxidizer. Phosphorus and sulfur are held to low levels to keep ductility and impact resistance where they need to be.
Mechanical Properties
These values are for the normalized (+N) or normalized-and-tempered (+NT) condition as specified in EN 10222-2.
Tensile Strength
| Property | Value |
|---|
| Rm — Tensile strength | 460 – 580 MPa |
Yield Strength by Section Thickness
| Property | ≤ 35 mm | 35 – 160 mm |
|---|
| ReH — Min. yield strength | 280 MPa | 255 MPa |
Impact Toughness (Charpy V-notch at +20 °C)
| Direction | KV min. (J) at +20 °C |
|---|
| Longitudinal | 48 |
| Transverse | 27 |
Elongation at Fracture
| Direction | A min. (%) |
|---|
| Longitudinal | 23 |
| Transverse | 21 |
International Equivalent Grades
P280GH (1.0426) does not have a perfect one-to-one match in other standard systems — the allowable chemistry ranges are not identical. Below are the closest grades. If you are converting specifications, pay special attention to the carbon limits, since that directly affects weldability.
ASME SA-105
ASTM A266 Cl.2
JIS G3202 SFVC2A
GB/T 12228 Gr.25
UNS K03014
Cross-Reference: P280GH vs. Common Equivalents
| Standard |
Designation |
C max (%) |
Notes |
| EN 10222-2 | P280GH / 1.0426 | 0.20 | Reference grade |
| ASME / ASTM | SA-105 / A105 | 0.35 | Higher C limit; check weldability |
| ASTM | A266 Class 2 | 0.30 | Pressure vessel forgings; closer match |
| JIS | SFVC2A (G3202) | 0.24 | Similar Mn range |
| GB (China) | Grade 25 (12228) | 0.22 | Nearest Chinese equivalent |
We regularly supply dual-certified forgings on a single Mill Test Certificate (MTC), covering both EN 10222-2 and ASME/ASTM requirements at the same time.
Forged Products We Make in 1.0426 (P280GH)
Our open-die forging shop produces the full range of pressure-rated parts in this grade. Every piece undergoes ultrasonic testing (UT), magnetic particle testing (MT) or liquid penetrant testing (PT) as needed, and ships in the normalized or normalized-and-tempered condition.
Forged Rings
Seamless Rolled Rings
Forged Flanges
Forged Discs
Tube Sheets
Forged Shafts
Round Bars
Hollow Bars
Forged Cylinders
Forged Blocks
Valve Bodies
Valve Bonnets
Valve Seat Rings
Valve Stems
Sleeves & Bushings
Pipe & Tubing
Casings & Shells
Hubs & Housings
Weld-Neck Flanges
Long Weld-Neck Nozzles
Self-Reinforced Nozzles
Cover Flanges
Channel Covers
Heat Exchanger Parts
Where P280GH (1.0426) Forgings Are Used
Power generation — boiler drums, headers, nozzles, and manhole frames in coal, gas, and biomass power plants. Steam piping flanges and weld-neck fittings. Some nuclear-grade piping parts when dual-certified.
Oil and gas — wellhead flanges, Christmas tree parts, valve bodies for pipeline service, and pressure vessel shell rings for separators and scrubbers.
Petrochemical and refining — reactor shell courses, tube sheets and channel covers for shell-and-tube heat exchangers, and tower internals such as support rings and tray rings.
General process industry — pressure vessel closures, forged nozzle necks, reinforcing pads, and storage-tank manhole flanges.
Heat Treatment and Delivery Condition
EN 10222-2 calls for P280GH forgings to be delivered in the normalized (+N) or normalized-and-tempered (+NT) condition. During normalizing, we heat the forgings to around 900–940 °C, hold until the piece is uniformly through-heated, then air-cool. This refines the grain and gives the right balance of strength and toughness.
For heavier sections, we add a tempering step at roughly 580–660 °C. Tempering takes out residual stress and bumps up ductility a bit without dropping the strength too much.
All heat treatment happens in-house at our Jiangyin factory, and the full thermal cycle is recorded on every MTC.
Frequently Asked Questions
What is 1.0426 (P280GH) steel?
1.0426 is the Werkstoff number for P280GH, a non-alloy carbon-manganese steel listed in EN 10222-2. It is used for pressure-bearing steel forgings that will run at higher temperatures. The "280" in the name means its minimum yield strength is 280 MPa, and "GH" marks it for elevated-temperature service. Jiangyin Jiangnan Metal Co., Ltd. makes custom open-die forgings in this grade at our factory in Jiangyin, Jiangsu Province, China.
What are the equivalent grades of 1.0426 (P280GH)?
The closest grades in other standards are ASME SA-105, ASTM A266 Class 2, JIS G3202 SFVC2A, and GB/T 12228 Grade 25. None is an exact match — the chemistry windows are different. The biggest difference is usually carbon: SA-105 allows up to 0.35% C, while P280GH caps at 0.20% C. That gap matters for weldability and carbon equivalent calculations.
What forged products can be made from 1.0426 steel?
We forge P280GH into seamless rolled rings, flanges (weld-neck, slip-on, blind, long weld-neck nozzles), discs, tube sheets, shafts, hollow bars, cylinders, valve bodies, bonnets, seat rings, and shell-and-tube heat exchanger parts. Piece weights run from 30 kg up to 30 tons.
What is the maximum service temperature for P280GH?
P280GH forgings are commonly used in continuous service up to about 400 °C (750 °F). Above that, you would normally switch to a chrome-moly grade like 16Mo3 (1.5415) or 13CrMo4-5 (1.7335). The actual design temperature limit depends on your design code and the applicable pressure equipment directive.
Why is the carbon limit only 0.20% in P280GH?
Keeping carbon at or below 0.20% is a trade-off between three things: getting enough strength from pearlite and solid-solution hardening, keeping the carbon equivalent (CEV) below 0.43 so the steel welds well, and holding on to decent impact toughness at low temperatures. That combination makes P280GH a practical choice for thick-section welded pressure vessels, especially when welding conditions on site are not ideal.
Where can I order custom 1.0426 (P280GH) forgings?
Jiangyin Jiangnan Metal Co., Ltd. is an open-die forging factory at No.1 Chengxiqiao Road, Zhouzhuang Town, Jiangyin City, Jiangsu Province, China. We make custom forged parts in carbon steel, alloy steel, stainless steel, tool steel, and nickel alloys. We do heat treatment, machining, and nondestructive testing in-house. Call us at 0086-189-2135-9659 or email sales@steelforgepieces.com for a quote.
Related Steel Grades
If you are looking at P280GH, you may also want to check these grades depending on your temperature, strength, or corrosion needs: