AISI 4140 / ASTM 4140 / SAE 4140 Hot Rolled Cold Drawm Qt Round Steel Bars

• Type: Alloy Steel Bar
• Standard: AISI, ASTM, GB, JIS, DIN, BS
• Technique: Quenched and Tempered
• Alloy: Alloy
• Commodity: Hardened and Tempered Steel Round Bar
• Grade: 42CrMo4 En10083
• Model NO.: AISI 4140 / ASTM 4140 / SAE 4140
• Techniques: Quenched and Tempered
• MOQ: 2tons
• 42CrMo4: Qt Steel Bar
• Transport Package: Standard Export Packing
• Specification: 10-300mm
• Origin: China
• Production Capacity: 3000tons/Month

Product Description

AISI 4140 / ASTM 4140 / SAE 4140 Hot Rolled Cold Drawm QT 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 Chromium-Molybdenum through-hardening steel of medium hardenability. It is a general purpose high-tensile steel with medium strength level and good impact properties.

4140 alloy steel is widely used for engineering steel purpose, such as: making various kinds of machinery, automobile, mining spare part, the gearwheel of the engine, the driving gear of supercharger, the connecting rob, the pinchock under the high pressure, parts for power train applications, cold formed fastener components, shafts, gears, drill collars for the oil exploration, etc.

1.Equivalent steel grade to aisi 4140 steel 

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

 

2.Chemical Composition for 4140 steel bars

Standard	Grade	C	Si	Mn	P	S	Cr	Mo
ASTM A29	4140	0.38-0.43	0.15-0.35	0.75-1.00	≤ 0.035	≤ 0.04	0.8-1.1	0.15-0.25
	42CrMo4	0.38-0.45	≤ 0.4	0.6-0.90	≤ 0.025	≤ 0.035	0.9-1.2	0.15-0.30
EN10083	1.7225
JIS G4105	SCM440	0.38-0.43	0.15-0.35	0.6-0.85	≤ 0.035	≤ 0.04	0.9-1.2	0.15-0.30
GB 3077	42CrMo	0.38-0.45	0.17-0.37	0.5-0.80	≤ 0.035	≤ 0.035	0.9-1.2	0.15-0.25
BS 970	EN19	0.35-0.45	0.15-0.35	0.5-0.80	≤ 0.035	≤ 0.035	0.9-1.5	0.2-0.40

3.Property of AISI 4140 Heat Treatment Steel  (Property can be changed by changing QT tempreture )
4140 steel quenched and tempered properties:
Yield strength of 4140 steel: 930MPa min
Tensile strength of 4140 steel: 1080MPa min
Elongation of 4140 steel: 12% min
Reduction area of 4140 steel: 50% min
Rockwell hardness of 4140 steel: 32HRC min
Brinell hardness of annealed 4140 steel: 217HB max

4.Quality control of 4140 steel bar:
1. Melting Process: EAF+LF+VD
2. Both ends cut by saw
3. Ratio of forging:minimum 3:1
4. Grain size of final product: according to ASTM E112 more than 5,preferred more than 8
5. Ultrasonic test: As per SEP1921 Class C/c or D/d

5.Delivery condition:
1): Straightness: 3mm/m (max) for hot rolled and QT, 1mm/m for cold drawn and QT
2): The ends cut by saw
3): No cracks on the surface
Packing:
1): Paint oil on the surface to protect steel bars from rusting.
2): Bundle packing by Iron Strips.
3): Bundle weight is from 2mt to 3 mt.
4): Two or three tags will be attached on each bundle. 

 

knurling 4140 steel / tapping 4140 steel / grinding 4
140 steel / turning 4140 steel / threading 4140 steel / cutting 4140 steel / drilling 4140 steel / forging 4140 steel / laser cutting 4140 steel / reaming 4140 steel / stick welding rod for 4140 steel /  bending 4140 steel / brazing 4140 steel / straightening 4140 steel / tg&p 4140 steel / polishing 4140 steel / cold drawing 4140 steel