Brief introduction of chemical composition, mechanical properties and main uses of 37CrNi3A Newstar Hardware Co.,Ltd. is China professional Hand Tools set manufacturer, classic hand tools in blow box, trolley, cabinet, bags and other OEM services per customer needs. We have different quality of tools depending on customer market needs, with different prices. If you want to purchase Tool Set Tool Kit from China, we would be a good partner to cooperate together. Hand Tools Set,Classic Hand Tools,Hand Tools Equipment,Hand Tools Gardening SUZHOU NEWSTAR HARDWARE CO.,LTD. , https://www.hardwarenewstar.com
Http://news.chinawj.com.cn
37CrNi3A
It is a grade of alloy structural steel specified by Chinese national standards.
Unified digital code: A42372
chemical composition
C: 0.34 to 0.41
Si: 0.17 to 0.37
Mn: 0.30 to 0.60
Cr: 1.20 to 1.60
Ni: 3.00 to 3.50
Mechanical properties [sample blank size] 25mm
[heat treatment]
Quenching heating temperature (°C): 820; coolant: oil tempering heating temperature (°C): 500; coolant: water, oil
[Mechanical properties]
Tensile strength (σb/MPa): ≧1130
Yield point (σs/MPa): ≧980
Elongation after break (δ5/%): ≧10
Area shrinkage (ψ/%): ≧50
Impact absorption work (Aku2/J): ≧47
Brinell hardness (HBS100/3000) (annealed or high temperature tempered state): ≦269
The main characteristics are high toughness, high hardenability, and oil-cooled can completely harden parts of Φ150mm. The creep resistance is stable at 450°. Low temperature impact toughness is good. There is a second type of temper brittleness when tempered in the range of 450 to 550 ° C, and a tendency to form white spots is large. Since the hardenability is very good, normalizing and high-temperature tempering must be used to reduce the hardness and improve the machinability. Generally used in quenched and tempered state.
Application examples are used to make heavy-duty, impact-resistant, large-section parts, or low-temperature, impacted parts or hot-forged, hot-stamped parts such as rotor shafts, impellers, and important fasteners. 
Editor: (Hardware Business Network Information Center) http://news.chinawj.com.cn
Chemical composition and mechanical properties of 37CrNi3A