Carbon Steel Hot Rolled Bar

• Type: Round
• Standard: AISI, ASTM, DIN, JIS, GB, BS
• Composition: Stainless Steel Scrap
• Technique: Forged
• Shape: Plate
• Surface Treatment: Polished
• Model NO.: Round bar
• Special Use: High-strength Steel Plate, Wear Resistant Steel, Silicon Steel, Cold Heading Steel, Free Cutting Steel, Mold Steel
• Application: Tool Steel Bar
• Transport Package: Wooden
• Specification: 6-400mm
• Trademark: Smooth
• Origin: China
• HS Code: 7214100000
• Production Capacity: 5000 Ton/Year

Product Description

Introduction:
AISI 4130 alloy steel is a medium carbon, low alloy steel specified under ASTM A29 standards. ASTM 4140
steel, commonly known as chromoly steel or chrome moly steel, contains nominally
0.28-0.33% Carbon, 0.8-1.1% Chromium, and 0.15-0.25% Molybdenum. It is comparable to 4140 steel
which has a higher carbon content (0.28-0.33%), providing 4130 material with enhanced weldability, though
at the expense of through thickness strength. With appropriate heat treatment, it is also easily machined.
Annealing ASTM 4130 alloy steel offers excellent ductility. AISI 4130 steel is usually available as
round bar, typically supplied in the hardened and tempered condition.

The AISI/SAE 4130 steel grade is a versatile alloy offering good resistance to atmospheric corrosion and
reasonable strength up to approximately 315º C (600º F). Its overall combination of strength,
toughness, and fatigue strength is commendable.

Chemical Composition

C	Mn	P	S	Si	Cr	Mo
0.28-0.33	0.40-0.60	0.035	0.040	0.15-0.35	0.80-1.10	0.15-0.25

AISI 4130 Steel Mechanical Properties

Properties	Metric
Tensile strength, ultimate	560 MPa
Tensile strength, yield	460 MPa
Modulus of elasticity	190-210 GPa
Bulk modulus (Typical for steel)	140 GPa
Shear modulus (Typical for steel)	80 GPa
Poissons ratio	0.27-0.30
Elongation at break (in 50 mm)	21.50%
Reduction of area	59.6
Hardness, Brinell	217
Hardness, Knoop (Converted from Brinell hardness)	240
Hardness, Rockwell B (Converted from Brinell hardness)	95
Hardness, Rockwell C (Converted from Brinell hardness, value below normal HRC range, for comparison purposes only.)	17
Hardness, Vickers (Converted from Brinell hardness)	228
Machinability (Annealed and cold drawn. Based on 100% machinability for AISI 1212 steel.)	70

Thermal Properties

Properties	Metric
Thermal conductivity (100°C)	42.7 W/mK

Forging of 4130 Alloy Steel
ASTM A29 Grade 4130 steel should beforged between 1230 and 950 º C (2250 and 1750 º F).
The lower the finishing temperature during forging, the finer the resultant grain size. If the 4130 alloy
steel is forged at too low a temperature, there is a risk of creating a non-uniform structure
in certain areas of the forged part, necessitating a normalizing treatment before further heat treatment.