4140 High Tensile Steel Engineering Steels + Alloys

• Type: Alloy Steel Bar
• Standard: AISI, ASTM, GB, JIS, DIN, BS
• Technique: Hot Rolled
• Application: Structural Steel Bar, Tool Steel Bar, Die Steel Bar
• Surface Treatment: Black
• Alloy: Alloy
• Model NO.: 4140 STEEL
• Special Use: Mold Steel
• Transport Package: Anti Rust
• Specification: M12-M310
• Production Capacity: 3000tons/Month

Product Description

Chinese	American	German	Japanese
GB	AISI	DIN	JIS
42CrMo	4140	1.7225	SCM440

	C	Si	Mn	Cr	Mo	Ti
42CrMo	0.38	0.17	0.5	0.9	0.15
	0.45	0.37	0.8	1.2	0.25
20CrMnTi	0.17	0.17	0.8	1		0.04
	0.23	0.37	1.1	1.3		0.1

Alloy steel bars are highly appreciated for its striking fetures such as resilient, fine finish, optimum tensile strength and corrosion resistant. We fabricate these products using optimum quality materials based on well versatile technology in complying with the quality standards. These products are widely used in various construction, automobiles and mechanical parts.

Tensile Strength	Yield Strength	Elongation	Reduction	I mpacting Energy	HBW
Rm,MPa	Rel,MPa	A,%	Z,%	Aku,J	≤
					After annealing
≥1080	≥930	≥12	≥45	≥63	217

1) High fatigue strength and impact resistance after tempering

2) Good low-temperature impact toughness

3) No obvious temper brittleness


Forging
Can be heated to 1150°C and maintained until uniform
Minimum forging temperature 850°C
Can be cooled slowly in sand or ash
Stress Relieving
Hardened: Heat to 500°C - 550°C
Annealed: Heat to 600°C - 650°C
Cool in still air
Annealing
Heat to 830°C - 850°C
Furnace cool
Normalizing
Heat to 870°C - 900°C
Cool in still air
Nitriding
Heat to 500°C - 530°C and hold for sufficient time to develop the depth of case required
Parts should be pre-hardened and tempered as required and also pre-machined leaving a small grinding allowance only.
Tempering
Heat to 450°C - 700°C cool in still air
Tempering in the range of 200°C - 420°C causes temper brittleness and should be avoided
Flame and Induction Hardening
All materials consisting of de-carburized surfaces should be removed to ensure best results.

Heat quickly to the required case depth at 860°C - 890°C and soak instantly in water or oil
Tempering at 150°C - 200°C helps reduce stresses in the case with marginal effect on its hardness
Hardening
Heat to 830°C - 880°C
Soak in oil or polymer


Machining
AISI 4140 has good machinability. Operations such as turning, hobbing, drilling, sawing, broaching, tapping and milling can be easily performed using the recommendations provided by the machine's manufacturer for ideal tool type-feeds and speeds. AISI 4140 has the following properties:

Machinability rating at 66% of B1112
Average cutting speed of 110 ft/min.