Guaranteed hardenable structural steel grades, with precise chemical composition and mechanical properties to ensure quality and performance. Below is a detailed table of various steel grades, their chemical compositions, and mechanical characteristics:
| Brand |
Chemical Composition (mass fraction) (%) |
| C |
Mn |
Cr |
Other |
| 45H |
0.42–0.50 |
|
|
|
| 20CrH |
0.17–0.23 |
0.70–1.10 |
|
|
| 40CrH |
0.37–0.44 |
|
|
|
| 45CrH |
0.42–0.49 |
|
|
|
| 40MnBH |
0.37–0.44 |
1.00–1.40 |
|
B: 0.0005–0.0035 |
| 45MnBH |
0.42–0.49 |
|
|
B: 0.0005–0.0035 |
| 20MnMoBH |
0.16–0.22 |
0.90–1.25 |
|
B: 0.0005–0.0035, Mo: 0.20–0.30 |
| 20MnVBH |
0.17–0.23 |
1.05–1.45 |
|
B: 0.0005–0.0035, V: 0.07–0.12 |
| 22MnVBH |
0.19–0.25 |
1.25–1.65 |
|
B: 0.0005–0.0035, V: 0.07–0.12 |
| 20MnTiBH |
0.17–0.23 |
1.20–1.55 |
|
B: 0.0005–0.0035, Ti: 0.04–0.10 |
| 20CrMnMoH |
0.17–0.23 |
0.85–1.20 |
1.05–1.40 |
Mo: 0.20–0.30 |
| 20CrMnTiH |
0.17–0.23 |
0.80–1.15 |
1.00–1.35 |
Ti: 0.04–0.10 |
| 20CrNi3H |
0.17–0.23 |
0.30–0.65 |
0.60–0.95 |
Ni: 2.70–3.25 |
| 12Cr2Ni4H |
0.10–0.17 |
0.30–0.65 |
1.20–1.75 |
Ni: 3.20–3.75 |
| 20CrNiMoH |
0.17–0.23 |
0.60–0.95 |
0.35–0.65 |
Ni: 0.35–0.75, Mo: 0.15–0.25 |
**Notes:**
1. The silicon content (mass fraction) of each grade ranges from 0.17% to 0.37%.
2. Residual elements in the steel should not exceed the following limits:
| Name |
P |
S |
Cu |
Cr |
Ni |
| High quality carbon structure |
0.040 |
0.040 |
0.25 |
0.25 |
0.25 |
| High quality alloy structural steel |
0.035 |
0.035 |
0.30 |
0.35 |
0.30 |
| Advanced high quality alloy structural steel |
0.030 |
0.030 |
0.25 |
0.35 |
0.30 |
3. The copper content (mass fraction) for hot-pressed steel should not exceed 0.20%.
**Hardness of steel in annealed or high temperature tempered state:**
| Brand |
Indentation diameter DHB/mm ≥ |
Brinell hardness HBS ≤ |
| 45H |
4.3 |
197 |
| 20CrH |
4.5 |
179 |
| 40CrH |
4.2 |
207 |
| 45CrH |
4.1 |
217 |
| 40MnBH |
4.2 |
207 |
| 45MnBH |
4.1 |
217 |
| 20MnVBH |
4.2 |
207 |
| 22MnVBH |
4.2 |
207 |
| 20MnTiBH |
4.4 |
187 |
| 20CrMnMoH |
4.1 |
217 |
| 20CrMnTiH |
4.1 |
217 |
| 20CrNi3H |
3.9 |
241 |
| 12Cr2Ni4H |
3.7 |
269 |
| 20CrNiMoH |
4.3 |
197 |
**Heat treatment system and impact absorption work of boron-containing steel:**
| Brand |
Sample blank size /mm |
Normalizing |
Quenching |
Temper |
Impact toughness ak / (J/cm²) ≥ |
| Temperature /°C |
Coolant |
Temperature /°C |
Coolant |
Temperature /°C |
Coolant |
| 40MnBH |
25 |
880–900 |
Air |
850±20 |
Oil |
510±30 |
Water |
69 |
| 45MnBH |
59 |
| 20MnMoBH |
15 |
930–950 |
880±10 |
200±20 |
Air or water |
69 |
| 20MnVBH |
860±20 |
200±10 |
| 22MnVBH |
200±20 |
| 20MnTiBH |
(3) These steels are suitable for machining parts. For more information on similar grades of high-quality carbon and alloy structural steel, refer to standard specifications.
Editor: Hardware Business Network Information Center
Source: http://news.chinawj.com.cn
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