Smooth Cold Work Mold Steel

• 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 superior medium carbon, low alloy steel as per ASTM A29 standards. It stands out for its excellent blend of strength and versatility.
Commonly known as chromoly steel or chrome moly steel, ASTM 4140 boasts remarkable properties.
With its nominal composition of 0.28-0.33% Carbon, 0.8-1.1% Chromium, and 0.15-0.25% Molybdenum, it closely resembles 4140 steel.
The slightly lower carbon content in 4130 (0.28-0.33%) enhances its weldability compared to 4140, albeit with a minor trade-off in through-thickness strength.
When subjected to appropriate heat treatment, its machinability is outstanding.
Annealing this alloy offers impressive ductility, and it is typically supplied as round bar in the hardened and tempered state.
AISI 4130 is often delivered in the form of round bars, known for their high performance in hardened and tempered conditions.

This steel grade is renowned for its versatility, offering good atmospheric corrosion resistance and retaining reasonable strength up to 315º C (600º F).
It provides a superb combination of strength, toughness, and fatigue resistance, making it highly reliable.
With these properties, it serves well in numerous demanding applications.

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 at temperatures ranging from 1230 to 950 º C (2250 to 1750 º F).
The final forging temperature significantly influences the grain size, where lower temperatures produce finer grains.
However, forging at excessively low temperatures can result in non-uniform structures, necessitating a normalizing treatment before any further heat treatments.
Properly executed forging ensures optimal structural uniformity and performance in the finished part.