Alloy Tool Steel Round Bar Rod

• 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 conforming to the ASTM A29 standard. ASTM 4140 steel
is also known as chromoly steel or chrome moly steel, featuring approximately
0.28-0.33% Carbon, 0.8-1.1% Chromium, and 0.15-0.25% Molybdenum. It is akin to 4140 steel,
which has a higher carbon level, offering improved weldability at the expense of through-thickness strength. With appropriate
heat treatment, it is also easily machined.
Annealing AISI 4130 alloy steel imparts excellent ductility. This steel is often provided as a round bar in the hardened
and tempered condition.

The AISI/SAE 4130 steel grade is a highly versatile alloy, exhibiting good atmospheric corrosion resistance and maintaining
reasonable strength up to about 315º C (600º F). It offers an excellent balance 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 beforgedbetween 1230 and 950 º C (2250 and 1750 º F).
The lower the finishing temperature from forging, the finer the grain size. If 4130 alloy steel is forged
at too low a temperature, there is a risk of forming a non-uniform structure in certain areas of the forged part, necessitating
a normalizing treatment before further heat treatment.