AISI 4140 Steel Coil, JIS SCM440, DIN 1.7225

AISI 4140 steel coil is an alloy steel material with high fatigue strength, durability, corrosion resistance, ductility and machinability, and is used in various industries. 4140 steel coil has good surface quality, smooth and beautiful appearance, high dimensional accuracy, good processing and forming performance and welding performance. 4140 steel coil composition and further information are below.

AISI 4140 Steel Coil Supply
Coil/Sheet/PlateThickness: 3-10mm; Width: 1200-1500mm;
Length: Can be customized(According to customer requirements)
Weight:about 20 Tons
Black Surface/Milling/Debarked/Turning/Cold Drawn

4140 Steel Coil Grade Equivalent Chart

Country USA Germany/UK/France JAPAN
Standard ASTM A29 / A29M-05 EN 10083/3-2006 JIS G4053-2008
Grades 4140 42CrMo4(1.7225) SCM440

4140 Steel Coil Chemical Composition

STAND C(%) Mn(%) P(%) S(%) Si(%) Cr(%) Mo(%) Ni(%)
ASTM A29 / A29M-05 0.38-0.43 0.75-1.00 Max 0.035 Max 0.040 0.15-0.35 0.80-1.10 0.15-0.25 -
EN 10083/3-2006 0.38-0.45 0.60-0.90 Max 0.025 Max 0.035 Max 0.40 0.90-1.20 0.15-0.30 -
JIS G4053-2008 0.38-0.43 0.60-0.90 Max 0.030 Max 0.030 0.15-0.35 0.90-1.20 0.15-0.30 ≤0.25

AISI 4140 Steel Coil Physical Properties

Properties Metric Imperial
Density 7.85 g/cm³ 0.284 lb/in³
Melting point 1416°C 2580°F

1.7225 Steel Coil Mechanical Properties

Properties Metric Imperial
Tensile strength 655 MPa 95000 psi
Yield strength 415 MPa 60200 psi
Bulk modulus(typical for steel) 140 GPa 20300 ksi
Shear modulus(typical for steel) 80 GPa 11600 ksi
Elastic modulus 190-210 GPa 27557-30458 ksi
Poisson's ratio 0.27-0.30 0.27-0.30
Elongation at break(in 50 mm) 25.70% 25.70%
Hardness, Brinell 197 197
Hardness, Knoop(converted from Brinell hardness) 219 219
Hardness, Rockwell B(converted from Brinell hardness) 92 92
Hardness, Rockwell C(converted from Brinell hardness. Value below normal HRC range, for comparison purposes only) 13 13
Hardness, Vickers(converted from Brinell hardness) 207 207
Machinability(based on AISI 1212 as 100 machinability) 65 65

ASTM 4140 Steel Coil Application

AISI 4140 steel round bar is an alloy structural steel with good strength and good comprehensive mechanical properties after heat treatment. It has good manufacturability. Maximum operating temperature is 427°C. It is used to manufacture forgings that require higher strength and larger quenched and tempered sections than 35CrMo steel, and can also be used to manufacture turbine fasteners, high-strength parts, valves, bolts, joints, hydromechanical shafts, couplings, tool bodies, molds , brake shoe, winch shaft, support plate filling block, etc.

4140 Steel Coil Application

4140 Steel Coil Characteristics

1.It is low alloy steel with chromium, molybdenum, and manganese.
2.Great toughness, fatigue strength, abrasion and impact resistance.
3.It is widely be used in the industry due to its excellent versatility and usefulness.
4.The higher carbon content in it, the higher the strength and heat treatment capabilities it is.
5.It can be oil hardened to relatively high hardenability.

4140 Steel Round Bar Coil Sheet Plate Heat Treatment

At the annealed condition, 4140 alloy tool steel has good machinability.

DIN 1.7225 steel has high ductility. It can be formed using conventional techniques in the annealed condition. It is required more pressure or force for forming because it is tougher than plain carbon steels.

4140 alloy steel can be welded using all advanced techniques. But, the mechanical properties of it will be affected if it is welded in the heat treated condition, and post weld heat treatment should be performed.

Heat Treatment
1.7225 tool steel is heated at 845°C(1550°F) followed by quenching in oil. Before hardening, it can be normalized by heating at 913°C (1675°F) for a long period of time followed by air cooling.

It is forged at 926 to 1205°C(1700 to 2200°F)

Hot Working
4140 steel can be hot worked at 816 to 1038°C(1500 to 1900°F)

Cold Working
1.7225 steel can be cold worked using conventional methods in the annealed condition.

Heat it to 800℃ – 850℃, hold until temperature is uniform throughout the section and cool in furnace.

Heat 1.7225 alloy steel to 870℃ – 900℃, hold it until the temperature is uniform throughout the section, soak for 10 – 15 minutes and cool in still air.

DIN 1.7225 steel can be tempered at 205 to 649°C (400 to 1200°F) depending upon the desired hardness level. The hardness of the steel can be increased if it has lower tempering temperature. For example, tensile strength of 225 ksi cab be achieved by tempering at 316°C (600°F), and tensile strength of 130 ksi can be achieved by tempering at 538°C (1000°F).

DIN 1.7225 alloy steel can be hardened by cold working, or heating and quenching.

4140 Steel Coil Supply

We can harden and temper materials to meet your specific application requirements, have our own cutting processing equipment, have rich production experience, and specifications can be cut and customized according to your requirements.

We have specialized in the production of 4140 alloy steel for decades, providing 4140/1.7225/SCM440 alloy steel coils, round bars, square steel, flat steel, etc., as a professional 4140 steel coil supplier, if you have any AISI 4140/DIN 1.7225 steel requirements ,Please contact us. Songshun Steel is with you.

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