Smooth Round Bar Die 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 renowned medium carbon, low alloy steel under the ASTM A29 standard. It
is widely known as chromoly steel or chrome moly steel, containing nominally 0.28-0.33% Carbon,
0.8-1.1% Chromium, and 0.15-0.25% Molybdenum. Similar to 4140 steel, which has a higher carbon
content, AISI 4130 offers superior weldability at the expense of some through-thickness strength. When
subjected to the appropriate heat treatment, this alloy is also highly machinable. Annealing the ASTM
4130 alloy steel enhances its ductility significantly. It is typically available as a round bar in a hardened
and tempered state.

AISI/SAE 4130 steel is an exceptionally versatile alloy, providing good atmospheric corrosion resistance
and maintaining reasonable strength up to approximately 315º C (600º F). It offers an excellent balance
of strength, toughness, and fatigue resistance.

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 between1230 and 950 º C (2250 and 1750 º F).The finer grain size is achieved by lowering the finishing temperature during forging. If the forging
temperature for 4130 alloy steel is too low, there is a risk of forming a non-uniform structure in certain
areas, necessitating a normalizing treatment before any further heat treatment.