Alloy Steel

This category covers a wide variety of steel that is generally heat treated to produce high strength levels of 750MPa and above. Typical applications include automotive engine and transmission components, bearings, rails, machine tools and wire ropes. Although engineering steels include carbon-manganese compositions (with a high C content), most contain small to large additions of other alloy elements such as Cr, Ni, V, Mo, W etc.

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DIMENSIONS
	Diam. 3mm ~1200mm (Cold drawn / Hot rolled / Forged)
	Block THK 100 ~ 800mm x Width 100 ~ 1600mm x Length 500 ~ 5800mm
	Flat THK 10 ~ 90mm x Width 60 x 550mm x Length 2500 x 5800mm

Brand Name	Nearest Related Specification	Typical Composition (%) & Properties
		C	Mn	P	S	Si	Cr	Mo	Ni
SAE 4140	1.7321 DIN 20MoCr4	0.38 ~ 0,43	0.75 ~ 1.00	0.03(max)	0.04(max)	0.15 ~ 0.35	0.80 ~ 1.10	0.15 ~ 0.25	–
Description & Applications: High and moderately stressed components for automobile industry and mechanical engineering – shafts, connecting rods, crankshafts, screws, etc.
SAE 4130	1.7218 DIN 25CrMo4	0.28 ~ 0.33	0.40 ~ 0.60	0.03(max)	0.04(max)	0.15 ~ 0.35	0.80 ~ 1 .10	0.15 ~ 0.25	–
Description & Applications: Used in the manufacturing of parts with smaller dimensions and/or material with good weldability and high toughness, particularly in the oil exploration industry.
SAE 4145		0.43 ~ 0.48	0.75 ~1 .00	0.03(max)	0.04(max)	0.15 ~ 0.35	0.80 ~ 1.10	0.15 ~ 0.25	–
Description & Applications:  Ideal applications include the manufacturing of tooling for the oil drilling industry.
SAE 4145H		0.42 – 0.49	0.65 – 1.10	0.03(max)	0.04(max	0.15 – 0.	0.75 ~ 1.20	0.30 ~ 0.4	1.4 – 1.7
Description & Applications: Ideal applications include the manufacturing of toolings for oil drilling (Stabilizers and Magnetic Drill Collars).
SAE 4340	DIN 40 Cr Ni Mo 6	0.38 ~ 0.43	0.60 ~ 0.80	0.03(max)	0.04(max)	0.15 ~ 0.35	0.70 ~ 0.90	0.20 ~ 0.30	1.65 ~2.00
Description & Applications: Permanently stressed machine, engine and vehicle parts when high strength and toughness are required. Typical applications are for structural use, such as aircraft landing gear, power transmission gears and shafts and other structural parts.
SAE 4320		0.17 ~ 0.22	0.45 ~ 0.65	0.03(max)	0.04(max)	0.15 ~ 0.35	0.40 ~ 0.60	0.20 ~ 0.30	1.65 ~ 2.00
Description & Applications: Widely used in the manufacturing of gears, sprockets, pins and machine components where there is demand for surface hardness obtained by the process of carburizing.
SAE 8620	DIN 21Ni Cr Mo 2	0.18 ~ 0.23	0.70 ~ 0.90	0.035(max)	0.04(max)	0.15 ~ 0.35	0.40 ~ 0.60	0.15 ~ 0.25	0.40 ~ 0.70
Description & Applications: Widely used in the manufacturing of gears, pins and parts where there is demand for surface hardness obtained by the process of carburizing or carbonitriding.
SAE 8640	DIN 40 Ni Cr Mo 22	0,38 – 0,43	0,75 – 1,00	0.03(max)	0.04(max)	0.15 ~ 0.35	0.40 ~ 0.60	0.15 ~ 0.25	0.40 ~ 0.70
Description & Applications: Widely used in the manufacturing of axles, connecting rods and crankshafts in the agricultural industry, and for automobiles, machinery and equipment, etc.
SAE 9840		0.38 ~ 0.43	0.7~ 0.9	0.04(max)	0.04(max)	0.2 ~ 0.35	0.7~ 0.9	0.2 ~ 0.3	0.85 ~ 1.15
Description & Applications: One of the most widely used precipitation hardening grades in the business. While soft and ductile in the solution annealed condition, it is also capable of high properties with a single precipitation or aging treatment. Characterized by good corrosion resistance, high hardness, toughness and strength.
AISI 3115	1.5919 DIN 15CrNi6	0.16	0.50	–	–	0.28	1.55	–	1.55
Description & Applications: Cutting tools, stamping, woodworking, drawing, deep drawing and pressing tools, cold working rolls, measuring tools.
18CrNiMo7-6	1.6587	0.15 – 0.21	0.5 – 0.9	0.025(max)	0.035(max)	≤ 0.4	1.5 – 1.8	0.25 – 0.35	1.4 – 1.7
Description & Applications:Heavy-duty arbors, bushings, wear pins, bearings, sprockets, gears and shafts etc. Can also be used for high-tensile, uncarburised applications but through hardened and tempered processes.
17CrNiMo6-4		0.14 ~0.20	0.60 ~0.90	0.035(max)	0.035(max)	≤ 0.4	0.80 ~1.10	0.15 ~0.25	1.20 ~1.50
Description & Applications: Heavy-duty arbors, bushings, wear pins, bearings, sprockets, gears and shafts etc. Can also be used for high-tensile, uncarburised applications but through hardened and tempered processes.