AISI 4130 Alloy Steel Bar (also known as 4130 Alloy Rod) is a chromium-molybdenum low-alloy steel with an excellent balance of toughness, tensile strength, and fatigue resistance. It is widely used in industries that demand both high strength and good weldability.
At Jiangsu Cunrui Metal Products Co., Ltd., we manufacture and supply 4130 Alloy Steel Bar in compliance with ASTM, SAE, and EN standards. Each batch is supported with mill test certificates, chemical composition reports, and third-party inspection when required. The material offers stable performance under heat treatment, good corrosion resistance, and long service life in demanding conditions.
Features & Advantages
High strength-to-weight ratio, suitable for engineering and structural parts
Good weldability without loss of mechanical properties
Excellent fatigue resistance for long-term use
Heat treatable to achieve different hardness and strength levels
Compliance with ASTM A29 / AISI 4130 standards, with SGS or BV inspection available
Applications
Automotive: gears, axles, crankshafts, connecting rods
Aerospace: aircraft engine mounts, structural fittings
Oil and Gas: drill collars, pipeline fittings, downhole tools
General Engineering: machinery shafts, fasteners, welded tubing components
Product Specifications & Technical Data
Basic Information
|
Specification |
Details |
|
Material Grade |
AISI 4130 / SAE 4130 / UNS G41300 |
|
Standards |
ASTM A29, ASTM A519, EN 10083 |
|
Diameter Range |
10mm – 600mm (custom sizes available) |
|
Length |
1m – 12m (cut-to-length available) |
|
Surface Finish |
Black, Bright, Polished, Ground, Coated |
|
Tensile Strength |
560 – 880 MPa |
|
Yield Strength |
≥ 460 MPa |
|
Elongation (A5) |
≥ 20% |
|
Hardness (HBW) |
197 – 241 (depending on heat treatment) |
|
Delivery Condition |
Annealed / Normalized / Quenched & Tempered |
Chemical Composition (wt%)
|
Element |
Content (%) |
|
Carbon (C) |
0.28 – 0.33 |
|
Silicon (Si) |
0.15 – 0.35 |
|
Manganese (Mn) |
0.40 – 0.60 |
|
Chromium (Cr) |
0.80 – 1.10 |
|
Molybdenum (Mo) |
0.15 – 0.25 |
|
Phosphorus (P) |
≤ 0.035 |
|
Sulfur (S) |
≤ 0.040 |
Customization Services
Special dimensions and tolerances
Cutting, machining, threading, and drilling available
Surface treatments: galvanizing, phosphating, anti-rust coating
Production according to customer drawings
Flexible MOQ, supporting both trial orders and bulk supply
Price & Delivery
Competitive unit price with bulk order discounts
Ready stock available in standard sizes
Fast and reliable delivery schedules
Stable supply chain ensuring long-term cooperation
Our Strength
Modern production facilities with advanced rolling, forging, and heat treatment lines
Export experience covering Europe, Middle East, South America, and Asia
Certifications: ISO, SGS, BV, TUV
Professional technical team providing engineering support
Large production capacity ensuring consistent supply
Service & Support
Fast inquiry response within 12 hours
Professional technical consultation for material selection
Export-standard packaging with wooden cases or steel bundles
Quality assurance with refund or replacement for defective products
Multiple logistics options including FOB, CIF, and door-to-door delivery
FAQ
Q1: Is 4130 Alloy Steel Bar the same as 4130 Alloy Rod?
Yes, the material is the same. The difference is mainly in the size and terminology.
Q2: Can 4130 Alloy Steel Bar be welded easily?
Yes, it has good weldability. Preheating and post-weld heat treatment are recommended for critical applications.
Q3: Do you provide machining and cutting services?
Yes, we offer CNC machining, drilling, threading, and custom cutting services.
Q4: What certificates do you provide?
Mill Test Certificate (EN 10204 3.1/3.2), chemical and mechanical test reports, third-party inspection on request.
Q5: What is your minimum order quantity (MOQ)?
We support flexible MOQs; small trial orders and large bulk orders are both accepted.
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