Die Steel Round Bar Specification

• Customization: Available
• Type: Round
• Standard: AISI, ASTM, DIN, JIS, GB, BS
• Model NO.: Round bar
• Composition: Stainless Steel Scrap
• Technique: Forged
• Shape: Plate
• Surface Treatment: Polished
• 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 in ASTM A29 standard. ASTM 4140
steel is also commonly referred to as a chromoly steel, or chrome moly steel, containing nominally
0.28-0.33% Carbon, 0.8-1.1% Chromium and 0.15-0.25% Molybdenum. It is similar to 4140 steel
which has a higher carbon level (0.28-0.33%), giving 4130 material improved weldability, at the
expense of through thickness strength. With the proper heat treatment it is also readily machined.
Annealing ASTM 4130 alloy steel offers excellent ductility. AISI 4130 steel is usually supplied as
round bar commonly in the hardened and tempered condition.

AISI/SAE 4130 steel grade is a versatile alloy with good atmospheric corrosion resistance and
reasonable strength up to around 315º C (600º F). It shows good overall combinations of strength,
toughness and fatigue strength.

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 be forged between 1230 and 950 º C (2250 and 1750 º F).
The lower the finishing temperature from forging, the finer will be the grain size. If the 4130 alloy
steel is forged at too low a temperature, there is a risk of the formation of a non-uniform structure
in certain areas of the forged part, necessitating a normalizing treatment, prior to further heat treatment.