ASTM A193 Gr. B7 AISI 4140 GB 42CrMo Steel Round Bar

• Customization: Available
• Type: Alloy Steel Bar
• Standard: AISI, ASTM, DIN, JIS
• Model NO.: A193 B7 4140
• Composition: Ferrous Steel Scrap
• Technique: Cold Drawn
• Shape: Bar
• Surface Treatment: Polished
• Special Use: High-strength Steel Plate, Wear Resistant Steel, Cold Heading Steel
• Application: Structural Steel Bar
• Surface: Bright Steel Rod
• Raw Material: Carbon Steel
• Main Grade: ASTM193 A193 B7 4140
• Supply Condition: Cold Drawn/Hot Rolled
• Ready Stock: 1000 Tons
• Free Samples: Yes
• Lead Time: 7-30 Days Noamally
• Customized: Customized
• Price: Negotiable
• Other Request: Acceptable
• Transport Package: Anti-Rust Packaging
• Trademark: Dajin
• Origin: China
• Production Capacity: 4000000 T/Year

Product Description

Model NO.

4140

Composition

Alloy

Technique

Rolled or Forged

Shape

Bar

Surface Treatment

Polished or Other

Special Use

for Oilfield

Application

for Oilfield

Transport Package

Anti-Corrosion

Specification

5-80mm

Trademark

Dajin

Origin

China

HS Code

7228600000

AISI 4140 G41400 Alloy Steel Round Bar

AISI4140 Steel Introduce

CD 4140 / 4142 alloy bar's chromium content provides good hardness penetration, and the molybdenum imparts uniformity of hardness and high strength.  This alloy responds well to heat treatment.  In the annealed condition it machines at 110 sfm.  It also has good wear resistance, toughness, and good ductility in the quenched and tempered condition.  This grade can also be supplied as turned ground and polished for tighter dimensional tolerances for bearing fitting applications.

AISI 4140 Cold drawn steel bar Typical applications

Typical applications are highly stressed parts or parts subject to severe wear..

AISI 4140 Cold drawn steel bar chemical composition(%)

Grade	C	Si	Mn	P	S	Cr	Mo
42CrMo4	0.38-0.45	0.17-0.37	0.40-0.70	≤0.035	≤0.035	0.90-1.20	0.15-0.25
1.7225	0.38-0.45	≤0.40	0.60-0.90	≤0.025	≤0.035	0.90-1.20	0.15-0.30
4140	0.38-0.43	0.15-0.35	0.75-1.00	≤0.035	≤0.040	0.80-1.10	0.15-0.25

AISI 4140 Typical Mechanical Properties
Grade:ASTM A29  4140  42CrMo  SCM440
Hardness:217HB  
Tensile  strength:1080(110)MPA  
Yield  strength: 930(95)MPA
elogation:12%  Reduction  of  area:45%   AKV(impact  value):63J
 

Heat Treatment  

AISI 4140 alloy steel is heated at 845°C (1550°F) followed by quenching in oil. Before hardening, it can be normalized by heating it at 913°C (1675°F) for a long period of time, followed by air cooling.
 

Forging  

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

Hot Working 

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

Cold Working  

AISI 4140 alloy steel can be cold worked using conventional methods in the annealed condition.
 

Annealing 

AISI 4140 alloy steel is annealed at 872°C (1600°F) followed by slowly cooling in the furnace.
 

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 a lower tempering temperature. For example, a tensile strength of 225 ksi can 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).
 

Hardening  

AISI 4140 alloy steel can be hardened by cold working, or heating and quenching.
 

Machinability  

AISI 4140 alloy steel has good machinability in the annealed condition.
 

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.
 

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.