alloy structural steel-k8凯发官网
alloy structural steel
1 main use
this steel is tempered and used to manufacture mechanical parts subjected to medium and medium speed work, such as the steering knuckle of the car, the rear axle and the gears, shafts, worms, spline shafts, tip sleeves, etc. on the machine tool; and after medium temperature tempering, it is used to manufacture parts subjected to high load, impact and medium speed work, such as gears, spindles, oil pump rotors, sliders, collars, etc.; after quenching and low temperature tempering, it is used to manufacture heavy load and low load. impact and wear-resistant parts with a solid thickness of 25mm or less on the cross-section, such as worm, spindle, shaft, collar, etc.; after quenching and tempering and high-frequency surface quenching, it is used to manufacture high surface hardness and wear resistance. parts without large impact, such as gears, sleeves, shafts, spindles, crankshafts, spindles, pins, connecting rods, screws, nuts, intake valves, etc.
2 grades and standards
grade; 40mn2 27simn 40mnb 40cr 15crmo 20crmo 30crmo 35crmo 42crmo12cr1mov
standard: gb/t3077-2015 and the technical agreement.
3 technical conditions of supply
3.1 product specifications
3～100×1500～3800×c, l
3.2 chemical composition
牌号 | 化学成分% | 其他 | ||||||
c | si | mn | cr | v | b | mo | ||
40mn2 | 0.37~0.44 | 0.17~0.37 | 1.4~1.8 | |||||
27simn | 0.24~0.32 | 1.1~1.4 | 1.1~1.4 | |||||
40mnb | 0.37~0.44 | 0.17~0.37 | 1.1~1.4 | 0.0005~0.0035 | ||||
40cr | 0.37~0.44 | 0.17~0.37 | 0.5~0.8 | 0.8~1.1 | ||||
15crmo | 0.12~0.18 | 0.17~0.37 | 0.4~0.7 | 0.8~1.0 | 0.4~0.55 | |||
20crmo | 0.17~0.24 | 0.17~0.37 | 0.4~0.7 | 0.8~1.0 | 0.15~0.25 | |||
30crmo | 0.26~0.34 | 0.17~0.37 | 0.4~0.7 | 0.8~1.0 | 0.15~0.25 | |||
35crmo | 0.32~0.40 | 0.17~0.37 | 0.4~0.7 | 0.8~1.0 | 0.15~0.25 | |||
42crmo | 0.38~0.45 | 0.17~0.37 | 0.5~0.8 | 0.9~1.2 | 0.15~0.25 | |||
12cr1mov | 0.8~0.15 | 0.17~0.37 | 0.4~0.7 | 0.9~1.2 | 0.15~0.3 | 0.25~0.35 | ||
3.3 力学性能
牌号 | 试样毛坯尺寸 | 热处理 | 拉伸试验 | ||||||
淬火 | 回火 | rel | rm | a | 断面收缩率% | 冲击功 | 布氏硬度 | ||
加热温度 | 加热温度 | mpa | mpa | % | hb100/3000 | ||||
mm | ℃ | ℃ | j≥ | ||||||
40mn2 | 25 | 840 | 540 | ≥735 | ≥885 | ≥12 | ≥45 | ≥55 | ≤217 |
27simn | 25 | 920 | 450 | ≥835 | ≥980 | ≥12 | ≥40 | ≥39 | ≤217 |
40mnb | 25 | 850 | 500 | ≥785 | ≥980 | ≥10 | ≥45 | ≥47 | ≤207 |
40cr | 25 | 850 | 520 | ≥785 | ≥980 | ≥9 | ≥45 | ≥47 | ≤207 |
15crmo | 25 | 900 | 650 | ≥295 | ≥440 | ≥22 | ≥60 | ≥94 | ≤179 |
20crmo | 25 | 880 | 500 | ≥685 | ≥885 | ≥12 | ≥50 | ≥78 | ≤197 |
30crmo | 25 | 880 | 540 | ≥785 | ≥930 | ≥12 | ≥50 | ≥63 | ≤229 |
35crmo | 25 | 850 | 550 | ≥835 | ≥980 | ≥12 | ≥45 | ≥63 | ≤229 |
42crmo | 25 | 850 | 560 | ≥930 | ≥1080 | ≥12 | ≥45 | ≥63 | ≤217 |
12cr1mov | 25 | 970 | 750 | ≥245 | ≥490 | ≥22 | ≥50 | ≥71 | ≤179 |