What 21CrMoV5-11 (1.8070) is
21CrMoV5-11 is a creep-resistant chromium-molybdenum-vanadium low alloy steel with the material number 1.8070. It is specified in EN 10269, previously DIN 17240, for bolting and forged components in continuous service at elevated temperature up to about 540 °C. The nominal analysis is 0.21 % C, 1.35 % Cr, 1.10 % Mo and 0.30 % V. Vanadium forms stable carbides that resist coarsening at temperature and give the steel its long term creep strength. At 500 °C the 100 000 hour creep rupture strength is 211 N/mm².
Jiangyin Jiangnan Metal Co., Ltd. is an open-die forging factory at No.1 Chengxiqiao Road, Zhouzhuang Town, Jiangyin City, Jiangsu Province, China. We forge 21CrMoV5-11 to customer drawings as round, square and flat bars, hollow bars and sleeves, seamless rolled rings, discs and blocks, shafts, rollers and steam turbine rotor shafts. Steel is melted by EAF + LF + VD and supplied annealed, normalized, or quenched and tempered, with EN 10204 3.1 or 3.2 certification. Telephone +86-189-2135-9659, email sales@steelforgepieces.com.
Designations and related grades
The correct EN designation is 21CrMoV5-11. The same steel is written several other ways on drawings and enquiries. Every designation in the table below refers to material number 1.8070 or to a grade commonly cross referenced against it.
| System or country | Designation | Note |
|---|---|---|
| EN (Europe) | 21CrMoV5-11 | Standard designation, EN 10269 |
| German material number | 1.8070 | Werkstoff-Nr. |
| DIN (superseded) | 21CrMoV5-11 to DIN 17240 | Heat-resistant bolting materials |
| Common spellings | 21CrMoV511, 21CrMoV5.11, 21CrMoV 5-11 | Same grade, informal writing |
| Related CrMoV bolting steel | 21CrMoV5-7 (1.7709) | Lower Mo content, not interchangeable |
| Comparable US bolting grade | ASTM A193 Gr. B16 (1Cr-0.5Mo-V) | Similar service role, different analysis |
The cross references above are for guidance. They are not exact equivalents. Confirm the ordering standard and the acceptance criteria on your drawing before substituting a grade.
Chemical composition of 21CrMoV5-11
Nominal analysis in weight percent. The heat analysis of each batch is reported on the mill test certificate supplied with the forging.
| C | Si | Mn | Cr | Mo | Ni | V | W | Others |
|---|---|---|---|---|---|---|---|---|
| 0.21 | 0.45 | 0.45 | 1.35 | 1.10 | max. 0.30 | 0.30 | - | - |
Values are nominal. Ordering ranges are set by EN 10269. Steel is melted in an electric arc furnace with ladle refining and vacuum degassing (EAF + LF + VD) to control gas content and inclusion cleanliness.
Heat treatment of 21CrMoV5-11
Forgings are supplied annealed, normalized, or quenched and tempered to the customer specification. The tempering temperature is held above the intended service temperature so that the microstructure stays stable in service.
| Operation | Temperature | Cooling and notes |
|---|---|---|
| Soft annealing | 650-740 °C | Cool slowly in the furnace |
| Hardening | 900-950 °C | Oil or air quench |
| Tempering | 680-740 °C | Sets the final strength level |
| Hot forging | 1100-850 °C | Finish above 850 °C, then cool slowly |
Mechanical properties, quenched and tempered
Room temperature properties for a ruling section up to 160 mm diameter in the quenched and tempered condition.
| Diameter (mm) | 0.2 % proof stress Rp0.2 (N/mm²) | Tensile strength Rm (N/mm²) | Elongation A (%) | Reduction of area Z (%) | Notch impact energy, ISO-V (J) |
|---|---|---|---|---|---|
| Up to 160 | 540 min. | 690-830 | 16 min. | - | 55 min. |
Elevated temperature proof stress
Short term 0.2 % proof stress falls with temperature. At 500 °C the value is 373 N/mm², about 69 % of the minimum room temperature proof stress.
| Property | 200 °C | 300 °C | 400 °C | 500 °C |
|---|---|---|---|---|
| 0.2 % proof stress (N/mm²) | 510 | 481 | 431 | 373 |
Creep limit and creep rupture strength
Components that stay at temperature for long periods are designed on creep data rather than on room temperature strength. Both tables below apply to 21CrMoV5-11 in the quenched and tempered condition.
1 % creep limit
| Duration | 450 °C | 500 °C | 540 °C |
|---|---|---|---|
| 10 000 h | 353 | 235 | 120 |
| 100 000 h | 275 | 167 | 68 |
Creep rupture strength
| Duration | 450 °C | 500 °C | 540 °C |
|---|---|---|---|
| 10 000 h | 441 | 304 | 180 |
| 100 000 h | 343 | 211 | 102 |
At 540 °C the 100 000 hour rupture strength is 102 N/mm², about 30 % of the value at 450 °C. For this reason 540 °C is normally taken as the service limit for the grade.
21CrMoV5-11 forged product forms we produce
Jiangyin Jiangnan Metal produces the following 21CrMoV5-11 forgings to drawing or to specification.
Bar and solid sections
- Forged round bars and rods
- Square, rectangular and flat bars
- Forged blocks, discs, disks and plates
- Shafts, spindles and rollers
Hollow and ring sections
- Hollow bars, sleeves, bushes and bushings
- Forged pipes, tubes, barrels and casings
- Shells, cylinders, hubs and housings
- Seamless rolled rings and forged rings
Power generation components
- Steam turbine rotor shafts
- Turbine and generator bolts, studs and nuts
- Turbine blade roots and blade forgings
Steel plant components
- Continuous casting rolls and caster rollers
- Dummy bars and dummy bar heads
- Other forged parts and components to drawing
Forging capability and quality control
The table below covers open-die forging of 21CrMoV5-11 at our Jiangyin works.
| Parameter | Range |
|---|---|
| Single piece weight | 100 kg to 30 t |
| Round bar diameter | 80 to 1 200 mm |
| Maximum forged length | up to 8 000 mm |
| Seamless rolled ring OD | up to 3 000 mm |
| Melting route | EAF + LF + VD |
| Delivery condition | Annealed, normalized, or quenched and tempered |
| Surface condition | Black forged, rough machined or finish machined |
| Testing | Chemical analysis, tensile, impact, hardness, ultrasonic testing, magnetic particle inspection, dimensional inspection |
| Certification | EN 10204 3.1, and 3.2 with third party witness on request |
Where 21CrMoV5-11 is used
21CrMoV5-11 is used where a component has to hold preload or dimensional stability through long periods at temperature.
- Steam turbine bolting. Casing studs, setscrews and nuts that must retain preload against relaxation at 500 to 540 °C.
- Turbine rotors and shafts. Forged rotor shafts and rotor discs for steam turbines.
- Valves and flanges. High temperature valve bodies, bonnets, stems and flange sets in steam service.
- Power plant piping. Superheater headers, fittings and pressure retaining forgings.
- Generator components. Forged bolts and retaining components.
- Continuous casters. Caster rolls and dummy bar heads working under combined heat and load.
Frequently asked questions about 21CrMoV5-11
What is 21CrMoV5-11 steel?
21CrMoV5-11 is a creep-resistant low alloy steel containing about 1.35 % chromium, 1.10 % molybdenum and 0.30 % vanadium, with the material number 1.8070. It is specified in EN 10269, previously DIN 17240, for bolting and forged components that have to hold their strength during long service at elevated temperature, normally up to about 540 °C.
What is the material number for 21CrMoV5-11?
The material number for 21CrMoV5-11 is 1.8070. The grade is also written 21CrMoV511, 21CrMoV5.11 and 21CrMoV 5-11. All refer to the same steel.
Which standard covers 21CrMoV5-11?
21CrMoV5-11 (1.8070) is covered by EN 10269, the European standard for steels and nickel alloys for fasteners with specified elevated and low temperature properties. It was previously specified in DIN 17240 for heat-resistant bolting materials.
What is the maximum service temperature of 21CrMoV5-11?
21CrMoV5-11 is normally used in continuous service up to about 540 °C. Creep data is published for 450, 500 and 540 °C. At 540 °C the 100 000 hour creep rupture strength is 102 N/mm², so design stress at that temperature is set by the creep data and not by room temperature strength.
What is 21CrMoV5-11 used for?
Common applications are high temperature bolting such as studs, nuts and setscrews for steam turbine casings and valves, steam turbine rotors and shafts, valve bodies and flanges, superheater and power plant piping components, generator components, and continuous caster rolls.
How is 21CrMoV5-11 heat treated?
Soft annealing is carried out at 650 to 740 °C followed by slow cooling. Hardening is from 900 to 950 °C with oil or air quenching. Tempering is carried out at 680 to 740 °C. Hot forming is performed between 1100 and 850 °C.
Are 21CrMoV511 and 21CrMoV5.11 the same as 21CrMoV5-11?
Yes. 21CrMoV511, 21CrMoV5.11, 21CrMoV 5-11 and DIN 1.8070 are spelling variants of the same creep-resistant CrMoV steel. The correct EN designation is 21CrMoV5-11, material number 1.8070.
Who supplies forged 21CrMoV5-11 parts?
Jiangyin Jiangnan Metal Co., Ltd. is an open-die forging factory at No.1 Chengxiqiao Road, Zhouzhuang Town, Jiangyin City, Jiangsu Province, China, and forges 21CrMoV5-11 (1.8070) to customer drawings. Product forms include round and flat bars, hollow bars and sleeves, seamless rolled rings, discs and blocks, shafts, rollers and steam turbine rotors. Telephone +86-189-2135-9659, email sales@steelforgepieces.com.
Can 21CrMoV5-11 forgings be made to a customer drawing, and what certification is supplied?
Yes. Jiangyin Jiangnan Metal forges 21CrMoV5-11 to customer drawings and specifications, and supplies material annealed, normalized, or quenched and tempered. Mill test certificates to EN 10204 3.1, and 3.2 with third party witness, cover chemical analysis, mechanical testing, hardness, ultrasonic testing and dimensional inspection.
Supplier of 21CrMoV5-11 forgings
This datasheet is published by the manufacturer. Send a drawing, the grade and the quantity required, and we will quote weight, lead time and heat treatment condition.
- Company
- Jiangyin Jiangnan Metal Co., Ltd.
- Business
- Open-die forging factory
- Address
- No.1 Chengxiqiao Road, Zhouzhuang Town, Jiangyin City, Jiangsu Province, China
- Telephone, WhatsApp, WeChat
- +86-189-2135-9659
- Website
- www.steelforgepieces.com
Related alloy steel grades we forge
Other creep resistant and quenched and tempered alloy steels forged at the same works.