Structural steel for nitriding, boiler steel for work at elevated temperatures 31CrMo12, 32CrMo12, 1.7361, 1.8515 according to EN 10085, DIN 17210.
| Standard | Steel Grade | ||||||||
|---|---|---|---|---|---|---|---|---|---|
| Chemical Composition % | |||||||||
| C: | Mn: | Si: | P: | S: | Cr: | Ni: | Mo: | Cu: | |
| EN/DIN | 31CrMo12 - 31 CrMo 12 - 1.8515 | ||||||||
| 0.28 - 0.35 | 0.4 - 0.7 | <0.4 | <0.035 | <0.035 | 2.8 - 3.3 | <0.6 | 0.3 - 0.5 | - | |
| EN | 32CrMo12 - 32 CrMo 12 - 1.7361 | ||||||||
| 0.28 - 0.35 | 0.4 - 0.7 | <0.4 | <0.025 | <0.035 | 2.8 - 3.3 | - | 0.3 - 0.5 | - | |
| DIN | 30CrMo12 - 30 CrMo 12 | ||||||||
| 0.28 - 0.35 | 0.4 - 0.7 | <0.4 | <0.035 | <0.035 | 2.8 - 3.3 | <0.6 | 0.3 - 0.5 | - | |
| PN | 25H3M | ||||||||
| 0.20 - 0.30 | 0.40 - 0.65 | 0.17 - 0.37 | <0.035 | <0.035 | 2.9 - 3.5 | <0.4 | 0.40 - 0.55 | - | |
| TU | 22Ch3M - 22Kh3M - 22Х3М | ||||||||
| 0.20 - 0.25 | 0.50 - 0.80 | 0.20 - 0.40 | <0.030 | <0.030 | 3.0 - 3.5 | <0.3 | 0.40 - 0.50 | - | |
| TU | 30Ch3MA - 30Kh3MA - 30Х3МА | ||||||||
| 0.27 - 0.35 | 0.30 - 0.60 | 0.17 - 0.37 | <0.025 | <0.025 | 2.8 - 3.2 | <0.5 | 0.25 - 0.35 | <0.25 | |
| BS | 722M24 - EN40B - 40B - HCM5 | ||||||||
| 0.20 - 0.28 | 0.45 - 0.70 | - | <0.035 | <0.035 | 3.0 - 3.5 | <0.4 | 0.45 - 0.65 | <0.4 | |
| AF | 30CD12 - 30 CD 12 | ||||||||
| 0.28 - 0.35 | 0.40 - 0.70 | <0.40 | <0.035 | <0.035 | 2.8 - 3.3 | <0.6 | 0.30 - 0.50 | - | |
32CrMo12, 1.7361, 31CrMo12, 1.8515 - specifications and application
25H3M grade, as well as 31CrMo12 / 1.7361 and 32CrMo12 / 1.8515, is alloyed structural steel for nitriding and work in elevated temperatures elevated up to about 600℃.
Used for the production of components and machine parts that require high surface hardness after nitriding, creep resistance, impact resistance, abrasion resistance, and good plasticity.
In the above mentioned grades are made connecting rods, screws, nuts, shafts, gears, spindles, gears for automotive, engineering and energy industries. Steel is not suitable for welding.
Steels are supplied in the form of hot rolled bars and forgings.
Mechanical properties of 31CrMo12 / 1.7361 in +QT condition according to EN 10085
- Dimensions 16 - 40mm
- Tensile strength, Rm: 1030 - 1230 MPa
- The yield point, Re: > 835 MPa
- Elongation, A:> 10%
- Impact resistance, KV20℃: >20 J
- Dimensions 40 - 100mm
- Tensile strength, Rm: 980 - 1180 MPa
- The yield point, Re: > 785 MPa
- Elongation, A:> 11%
- Impact resistance, KV20℃: >20 J
- Dimensions 100 - 160mm
- Tensile strength, Rm: 930 - 1130 MPa
- The yield point, Re: > 735 MPa
- Elongation, A:> 12%
- Impact resistance, KV20℃: >20 J
- Dimensions 160 - 250mm
- Tensile strength, Rm: 880 - 1080 MPa
- The yield point, Re: > 675 MPa
- Elongation, A:> 12%
- Impact resistance, KV20℃: >20 J
- Surface after nitriding - Hardness HV1: 800
Mechanical properties of 32CrMo12 in +QT condition according to EN10250 for forgings
- Dimensions <160mm
- Tensile strength, Rm: >900 MPa
- The yield point, Re: > 680 MPa
- Elontation for longitudinal samples, A: > 12%
- Elongation for transverse samples, A:> 8%
- Impact resistance, KV20℃: >20 J
- Impact resistance, KV20℃: >20 J
- Dimensions 160 - 330mm
- Tensile strength, Rm: >850 MPa
- The yield point, Re: > 630 MPa
- Elontation for longitudinal samples, A: > 13%
- Elongation for transverse samples, A:> 9%
- Impact resistance, KV20℃: >20 J
- Impact resistance, KV20℃: >20 J
- Dimensions >330mm
- Tensile strength, Rm: >900 MPa
- The yield point, Re: > 680 MPa
- Elontation for longitudinal samples, A: > 15%
- Elongation for transverse samples, A:> 11%
- Impact resistance, KV20℃: >20 J
- Impact resistance, KV20℃: >20 J
Heat treatment processes:
- Grade 31CrMo12 / 1.8515
- Softening annealing at a temperature of 650 - 700 ℃
- Hardening in oil or water at a temperature of 870 - 930 ℃ (austenisation for 0.5H minimum)
- Tempering at a tempering of 580 - 700℃ (1H minimum)
- Nitriding at a temperature of 480 - 570℃
- Grade 32CrMo12 / 1.7361
- Hardening at a temperature of 890 - 940℃
- Tempering at a temperature of 550 - 740℃
In the above mentioned grades the company provides:
- Hot-rolled round and square bars 31CrMo12, 32CrMo12, 1.7361, 1.8515
- Rings, sleeves, shafts and forgings 31CrMo12, 32CrMo12, 1.7361, 1.8515
Other replacements and equivalents of the grade:
25H3M, 31CrMo12, 31 CrMo 12, 32CrMo12, 32 CrMo 12, EN40B, 722M24, 722 M 24, 30CrMo12, 30 CrMo 12, 1.8564, 1.7361, 1.8515, 24CrMo13-6, 1.8516, 40B, HCM5, 30CD12, 30 CD 12, 25Cr13Mo6, F-124.A, SS 2240, 22Ch3M, 22Kh3M, 22Х3М, 30Ch3MA, 30Kh3Ma, 30Х3МА.