France · AFNOR NF
51 CrV 4
NF A35-571 — Iron and steel. Alloy structural steels for hot formed spring manufacture(AM1-1977)
Chemical composition
| Element | min | max | Similar | Remarks |
|---|---|---|---|---|
| C | 0.47 | 0.55 | ||
| Cr | 0.9 | 1.2 | ||
| Mn | 0.7 | 1.1 | ||
| P | 0.025 | |||
| S | 0.025 | |||
| Si | 0.1 | 0.4 | ||
| V | 0.07 | 0.25 |
Mechanical properties
| Heat treatment / condition | Yield strength | Tensile strength | Elongation | Reduction of area | Impact energy | Hardness |
|---|---|---|---|---|---|---|
| bars, flats, steel bars, wire, quenched and tempered | 1200.00 | 1350.00 | 6.00 | 8.00 | ||
| bars, HR, steel bars, wire, hardened | 扁钢 56.00 |
Physical properties
| Elastic modulus | Mean thermal expansion | Thermal conductivity | Specific heat | Resistivity | Density | Poisson's ratio |
|---|---|---|---|---|---|---|
| 210.00 |
Typical physical values
| Density | Elastic modulus | Poisson's ratio | Remarks |
|---|---|---|---|
| 7.72–8.00 | 190.00–210.00 | 0.27–0.30 | 典型属性数值，工具钢。此值不来源于标准，它是指示性指标，不能被用于设计用途。 |
| 7.85 | 200.00–207.00 | 0.27–0.30 | 低碳钢低合金钢的材料性能属性数值，此值不来源于标准，它是指示性指标，不能被用于设计用途。 |
Heat treatment
| Type | 1 |
|---|---|
| Heat-treatment curve | CCT modified |
| Heat-treatment curve | Hardness-Tempering |
| Heat-treatment curve | CCT |
| Heat-treatment curve | TTT |
| Heat-treatment curve | 淬透性 |
Similar grades
| Grade | Region | System |
|---|---|---|
| 1.8159 |  Italy | UNI |
| 51 CrV 4 | Italy | UNI |
| 1.8159 |  Spain | UNE |
| 1.8159 |  Romania | STAS |
| 51 CrV 4 | Romania | STAS |
| 1.8159 |  Sweden | SS |
| 51 CrV 4 | Sweden | SS |
| 1.8159 |  Switzerland | SNV |
| 51 CrV 4 | Switzerland | SNV |
| 1.8159 |  Finland | SFS |
| 51 CrV 4 | Finland | SFS |
| 1.8159 |  Poland | PN |
| 51 CrV 4 | Poland | PN |
| 1.8159 |  Austria | ONORM |
| 51 CrV 4 | Austria | ONORM |
| 1.8159 |  Norway | NS |
| 1.8159 |  Belgium | NBN |
| 1.8159 |  Hungary | MSZ |
| 51 CrV 4 |  Germany | DIN |
| 1.8159 | Czech Republic | CSN |
| 51 CrV 4 | Czech Republic | CSN |
| 1.8159 | Bulgaria | BDS |
| 51 CrV 4 | Bulgaria | BDS |
| 1.8159 |  United Kingdom | B.S. |
| 1.8159 | France | AFNOR NF |
| 51 CrV 4 | Hungary | MSZ |
| 51 CrV 4 | Norway | NS |
| 51 CrV 4 | Belgium | NBN |
| 51 CrV 4 | Spain | UNE |
| GS-50 CrV 4 | Germany | SEW |
| 50 CrV 4 | Germany | DIN |
| 1.8159 | Germany | DIN |
| 51 CrV 4 | United Kingdom | B.S. |