Creep-resistant 2.25Cr-1Mo alloy steel forgings for pressure purposes, supplied to EN 10222-2 by Jiangyin Jiangnan Metal Co., Ltd.
11CrMo9-10, material number 1.7383, is a creep-resistant chromium-molybdenum alloy steel of the 2.25Cr-1Mo family. EN 10222-2 covers it as a grade for steel forgings used in pressure equipment at elevated temperature. The steel carries 2.00 to 2.50 % chromium and 0.90 to 1.10 % molybdenum, with carbon held down to 0.08 to 0.15 %. It holds useful strength in continuous service to roughly 500 °C and resists hydrogen attack.
On drawings the grade is usually cross-referenced against its ASTM counterparts A182 Grade F22, A335 Grade P22 and A387 Grade 22. Jiangyin Jiangnan Metal Co., Ltd., an open-die forging factory in Jiangyin, Jiangsu Province, China, forges 11CrMo9-10 into bars, seamless rolled rings, discs, blocks, hollow bars and sleeves in the +NT, +QT and +QL delivery conditions.
Three EN grades share the 2.25Cr-1Mo composition: 10CrMo9-10 (1.7380), 11CrMo9-10 (1.7383) and 12CrMo9-10 (1.7375). They differ in carbon range and in the product standard that governs them. 11CrMo9-10 is the forging grade, which is why it turns up on reactor shells, hydrocracker parts, boiler headers and high-temperature valve bodies rather than on plate.
Hydrogen service is the other reason the grade gets specified so often. API RP 941 sets out the Nelson curves used to judge resistance to high-temperature hydrogen attack, and at 2.25 % chromium this steel sits well above plain carbon steel and the 1Cr-0.5Mo grades. Refinery hydroprocessing equipment has been built from it for decades.
EN 10222-2 sets the following composition limits for 11CrMo9-10 (1.7383). Figures are percentages by mass on the ladle analysis. Jiangyin Jiangnan Metal supplies every 11CrMo9-10 forging with a heat analysis, and a product analysis on the finished piece where the order calls for one.
| Element | C | Si | Mn | P | S | Cr | Mo |
|---|---|---|---|---|---|---|---|
| % by mass | 0.08 to 0.15 | max 0.50 | 0.40 to 0.80 | max 0.025 | max 0.015 | 2.00 to 2.50 | 0.90 to 1.10 |
Source: EN 10222-2, Steel forgings for pressure purposes, Part 2: Ferritic and martensitic steels with specified elevated temperature properties.
Room-temperature properties depend on the delivery condition and on the nominal thickness of the forging. Three conditions are recognised: +NT, normalised and tempered; +QT, quenched and tempered; and +QL, quenched and tempered with low-temperature impact requirements.
| Delivery condition | Nominal thickness | Rm, tensile strength | ReH, min. yield strength |
|---|---|---|---|
| +QT, quenched and tempered | all | 540 to 680 MPa | 355 MPa |
| +NT, normalised and tempered | to 200 mm | 520 to 670 MPa | 310 MPa |
| +NT, normalised and tempered | 200 to 500 mm | 450 to 600 MPa | 265 MPa |
| +QL | all | 520 to 670 MPa | 310 MPa |
| Orientation | to 200 mm | 200 to 500 mm |
|---|---|---|
| Longitudinal | 20 % | 23 % |
| Transverse | 20 % | 21 % |
| Condition | to 60 mm | 60 to 100 mm |
|---|---|---|
| +QL | 18 % | 17 % |
| Specimen orientation | Test temperature | KV, impact energy |
|---|---|---|
| Longitudinal | +20 °C | 40 to 60 J |
| Transverse | +20 °C | 27 to 50 J |
Values apply to the as-delivered condition at room temperature. Acceptance criteria for a given order are agreed at enquiry stage and confirmed on the EN 10204 inspection certificate issued with each forging.
11CrMo9-10 belongs to the international 2.25Cr-1Mo group. Below are the grades most often cross-referenced against it on enquiries and drawings. Chemistry is nominally the same across the group, while product form, carbon range and testing regime differ, so equivalence should be confirmed against the applicable design code before any substitution.
| Standard and region | Designation | Product form |
|---|---|---|
| EN 10222-2, Europe | 11CrMo9-10 / 1.7383 | Forgings, pressure purposes |
| EN 10028-2 and EN 10216-2 | 10CrMo9-10 / 1.7380 | Plate and seamless tube |
| EN | 12CrMo9-10 / 1.7375 | Related higher-carbon grade |
| ASTM and ASME, USA | A182 Grade F22 | Forged flanges, fittings, valves |
| ASTM and ASME, USA | A336 Grade F22 | Forgings for pressure vessels |
| ASTM and ASME, USA | A335 Grade P22 | Seamless ferritic pipe |
| ASTM and ASME, USA | A387 Grade 22 Class 1 and 2 | Pressure vessel plate |
| UNS, USA | K21590 and K21390 | Not applicable |
| GB, China | 12Cr2Mo1 and 12Cr2Mo1R | Forgings and plate |
| JIS, Japan | SCMV4, STPA24, SFVAF22 | Plate, pipe, forgings |
| NF, France | 10CD9-10 and 12CD9-10 | Plate and tube |
| GOST, Russia | 10Kh2M and 1Kh2M | Plate and forgings |
| CSN, Czechia | 15 313 | Plate and forgings |
Cross-references are indicative. Jiangyin Jiangnan Metal can quote against the EN designation or against the equivalent ASTM, GB or JIS grade named on your drawing.
Jiangyin Jiangnan Metal produces 11CrMo9-10 as open-die and ring-rolled forgings only, with no castings and no welded fabrication. Forms made to drawing include:
Pieces ship as-forged, rough-machined with a machining allowance, or fully CNC-finished to drawing tolerance.
11CrMo9-10 goes into equipment that has to hold pressure at temperature over a long service life:
11CrMo9-10 gets its properties from a two-stage treatment after forging. The sequence below is typical. Exact temperatures and soak times follow from section thickness and appear on the heat-treatment chart supplied with the order.
Tempering has to be carried out above the post-weld heat treatment temperature the component will later see. Otherwise PWHT will pull down the strength achieved in the forging.
11CrMo9-10 welds with the usual arc processes, but as a hardenable Cr-Mo steel it needs thermal control. Preheat runs around 200 to 250 °C and is held as interpass temperature. Consumables should be low-hydrogen and matched to the 2.25Cr-1Mo composition. Post-weld heat treatment at roughly 690 to 730 °C is standard practice on pressure-retaining welds, both to temper the heat-affected zone and to take out residual stress.
Refinery specifications for 2.25Cr-1Mo equipment in hydrogen service usually add step-cooling and temper-embrittlement requirements on top of that. Check the welding procedure against the job specification before work starts.
Jiangyin Jiangnan Metal Co., Ltd. is an open-die forging factory in Jiangyin, Jiangsu Province, China that makes 11CrMo9-10 (1.7383) forgings to EN 10222-2 and to the equivalent ASTM A182 F22, ASTM A336 F22 and GB 12Cr2Mo1 designations. Work is done to customer drawing rather than sold from a catalogue, and every piece leaves with an EN 10204 3.1 mill test certificate.
To price a part, send a drawing or a description giving outside dimensions, wall thickness or bore, required delivery condition (+NT, +QT or +QL), applicable standard, quantity, and any NDT or third-party inspection requirement. Where no drawing exists yet, outside diameter, length and weight are enough for a budget figure.
11CrMo9-10 is a creep-resistant chromium-molybdenum alloy steel with a nominal 2.25Cr-1Mo composition, covered by EN 10222-2 for forgings used in pressure equipment at elevated temperature. Its material number is 1.7383. It contains 2.00 to 2.50 % chromium, 0.90 to 1.10 % molybdenum and 0.08 to 0.15 % carbon, and it is used in continuous service to roughly 500 degrees Celsius.
The material number, or Werkstoffnummer, of 11CrMo9-10 is 1.7383. It is sometimes written as W.-Nr. 1.7383 or EN 1.7383 on European drawings and mill certificates.
The closest ASTM equivalents to 11CrMo9-10 are ASTM A182 Grade F22 for forged flanges, fittings and valves, ASTM A336 Grade F22 for pressure vessel forgings, ASTM A335 Grade P22 for seamless pipe and ASTM A387 Grade 22 for pressure vessel plate. All are 2.25Cr-1Mo steels sharing the same nominal chemistry. Jiangyin Jiangnan Metal Co., Ltd. quotes 11CrMo9-10 against either the EN or the ASTM designation.
Both are 2.25Cr-1Mo creep-resistant steels with almost identical alloy content. 10CrMo9-10 (1.7380) is the designation used for plate to EN 10028-2 and seamless tube to EN 10216-2, while 11CrMo9-10 (1.7383) is the designation used for forgings for pressure purposes to EN 10222-2. For a buyer the practical difference is product form and governing standard rather than metallurgy.
11CrMo9-10 is normally used in continuous service to roughly 500 degrees Celsius. Above that the design allowable stress falls sharply and creep governs the design. For higher temperatures engineers generally move to a 9Cr-1Mo grade such as X10CrMoVNb9-1, known as P91.
Yes. The 2.25Cr-1Mo composition is the classical material for high-temperature hydrogen service, and its resistance to high-temperature hydrogen attack is judged using the Nelson curves in API RP 941. Hydrocracker and hydrotreater reactor components in refineries are built from it for that reason. The specific operating point still has to be checked against the applicable Nelson curve for the design temperature and hydrogen partial pressure.
Yes. Preheat of roughly 200 to 250 degrees Celsius is normally required and held as interpass temperature, and post-weld heat treatment at roughly 690 to 730 degrees Celsius is standard practice on pressure-retaining welds. The forging should be tempered above the PWHT temperature it will later see, so that PWHT does not pull down the delivered properties.
Jiangyin Jiangnan Metal Co., Ltd. supplies 11CrMo9-10 as open-die forged round, square, flat, rectangular and hexagonal bars, seamless rolled rings and flange blanks, forged discs, disks, blocks and plates, and hollow bars, sleeves, bushings, cylinders, shells, hubs and housings. Pieces are available as-forged, rough-machined or CNC-finished to drawing.
Jiangyin Jiangnan Metal Co., Ltd. is an open-die forging factory at No.1 Chengxiqiao Road, Zhouzhuang Town, Jiangyin City, Jiangsu Province, China that makes 11CrMo9-10 (1.7383) forgings to EN 10222-2 and equivalent ASTM, GB and JIS designations. Enquiries go to sales@steelforgepieces.com or +86 189 2135 9659, and drawings are quoted within 24 hours.
Every 11CrMo9-10 forging from Jiangyin Jiangnan Metal Co., Ltd. ships with an EN 10204 3.1 inspection certificate covering heat analysis, mechanical test results and heat-treatment records. An EN 10204 3.2 certificate endorsed by TUV, SGS, BV or Lloyd's Register can be arranged on request, along with ultrasonic, magnetic-particle and dye-penetrant test reports.
Jiangyin Jiangnan Metal Co., Ltd. accepts orders from a single piece, including one-off prototypes and replacement parts made from a sample or a sketch. Because the forgings are made to drawing rather than drawn from stock, there is no catalogue minimum.
Send a drawing, or the outside diameter, length, wall thickness and quantity. Jiangyin Jiangnan Metal replies with price, weight and lead time within 24 hours.
