4140 Steel Bar / AISI A29 1.7225 42CrMo4 Scm440 Alloy Round Steel Bars

• Type: Alloy Steel Bar
• Standard: AISI, ASTM, GB, JIS, DIN, BS
• Technique: Hot Rolled
• Application: Structural Steel Bar, Tool Steel Bar, Die Steel Bar
• Alloy: Alloy
• Special Use: Mold Steel, Free Cutting Steel, Cold Heading Steel
• Model NO.: 4140 Steel Bar
• Delivery Condition 1: Hot Rolled
• Delivery Condition 2: Annealed + Cold Drawn
• Delivery Condition 3: Peeled
• Delivery Condition 4: Quenched and Tempered
• Delivery Condition 5: Annealed
• Delivery Condition 6: Normalized
• Delivery Condition 8: Cold Drawn / Peeled +Q&T
• Transport Package: Standard Sea Worthy
• Specification: 16mm to 310mm
• Trademark: Laiwu Xincheng
• Origin: China
• HS Code: 72283090
• Production Capacity: 3000tons/Month

Product Description

4140 Steel Bar / AISI A29 1.7225 42CrMo4 SCM440 Alloy Round Steel Bars

.AISI 4140 alloy steel is chromium, molybdenum, manganese containing low alloy steel. It has high fatigue strength, abrasion and impact resistance, toughness, and torsional strength. 

4140 steel is a alloy structural steel, 4140 is used for engineering structural, like high tensile shafts, bolts and nuts, gears, pinions and spindles. Locomotive traction with the big gear, supercharger drive gear, pressure vessel, rear axle, gear load of connecting rod and a spring clip,4140 can also be used to under 2000 m deep well of oil drill pipe joint and the fishing tool, and can be used for bending machine mould, etc

1.Equivalent grades

GB,YB	JIS	DIN(W-Nr.)		BS	NF
42CrMo	SCM440/(SCM4)	42CrMo4-1.7225	4140	708M40/709M40/708A42/EN19	42CD4

2.Chemical composition of equivalent grades

ASTM A29/29M	C	Si	Mn	Cr	Mo	P	S
4140	0.38~0.43	0.15~0.35	0.75~1.00	0.80~1.10	0.15~0.25	≤0.035	≤0.040
DIN WN-r	C	Si	Mn	Cr	Mo	P	S
1.7225	0.38~0.45	≤0.40	0.60~0.90	0.90~1.20	0.15~0.30	≤0.035	≤0.035
GB/T	C	Si	Mn	Cr	Mo	P	S
42CrMo	0.38~0.45	0.17~0.37	0.50~0.80	0.90~1.20	0.15~0.25	≤0.030	≤0.030
BS	C	Si	Mn	Cr	Mo	P	S
708M40	0.36~0.44	0.10~0.35	0.70~1.00	0.90~1.20	0.15~0.25	≤0.035	≤0.035
JIS	C	Si	Mn	Cr	Mo	P	S
SCM440	0.38~0.43	0.15~0.35	0.60~0.85	0.90~1.20	0.15~0.30	≤0.030	≤0.030

3.Mechanical Properties of 4140 alloy steel

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

4.Supply Size range
Hot Rolled 4140 steel bar: Ø16mm-310mm
Forging 4140 steel bar: Ø250mm-1000mm
Cold drawn 4140 steel bar:Ø12-100mm
Q&T 4140 steel bar:Ø16-310mm


5.Annealing
AISI 4140 alloy steel is annealed at 872°C (1600°F) followed by slowly cooling in the furnace.
6.Tempering
AISI 4140 alloy 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 a tensile strength of 130 ksi can be achieved by tempering at 538°C (1000°F).
Hardening
AISI 4140 alloy steel can be hardened by cold working, or heating and quenching.

7. Forming
AISI 4140 alloy steel has high ductility. It can be formed using conventional techniques in the annealed condition. It requires more pressure or force for forming because it is tougher than plain carbon steels.

8. Welding
AISI 4140 alloy steel can be welded using all conventional techniques. However, the mechanical properties of this steel will be affected if it is welded in the heat treated condition, and post weld heat treatment should be performed.

9. Forging
AISI 4140 alloy steel is forged at 926 to 1205°C (1700 to 2200°F)

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

11.Cold Working
AISI 4140 alloy steel can be cold worked using conventional methods in the annealed condition.
12. Processing
AISI 4140 steel round bar and flat sections can be cut to your required sizes. ASTM 4140 tool steel ground bar can also be supplied, providing a high quality tool steel precision ground tool steel bar to your required tolerances. SAE 4140 steel is also available as Ground Flat Stock / Gauge Plate, in standard and nonstandard sizes.

4140 Steel Bar AISI A29 | 1.7225 | 42CrMo4 | SCM440,AISI 4140 steel | 1.7225 | 42CrMo4 | SCM440,HIGH TENSILE STEEL - AISI 4140,AISI 4140 alloy (JIS SCM-440) 4140 Steel Bar AISI A29 | 1.7225 | 42CrMo4 | SCM440,AISI 4140 steel | 1.7225 | 42CrMo4 | SCM440,HIGH TENSILE STEEL - AISI 4140,AISI 4140 alloy (JIS SCM-440)