China Origin Steel Bar 6-400mm

• 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 conforming to ASTM A29 standards. ASTM 4140
steel, often referred to as chromoly steel or chrome moly steel, is composed of a nominal mix of
0.28-0.33% Carbon, 0.8-1.1% Chromium, and 0.15-0.25% Molybdenum. Although it resembles 4140 steel,
which contains a higher level of carbon (0.28-0.33%), 4130 material offers improved weldability, albeit with
a slight compromise in through-thickness strength. However, with the correct heat treatment, it is easily machined.
Annealing ASTM 4130 alloy steel enhances its ductility. Typically supplied as a round bar, AISI 4130 steel is
most often delivered in a hardened and tempered state.

AISI/SAE 4130 grade steel is a highly versatile alloy, providing good atmospheric corrosion resistance and
maintaining reasonable strength at temperatures up to approximately 315º C (600º F). Its overall strength,
toughness, and fatigue resistance make it a reliable choice.

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 during forging, the finer the resulting grain size. If 4130 alloy
steel is forged at excessively low temperatures, a non-uniform structure may form in certain areas, necessitating
a normalizing treatment before any further heat treatment can be applied.