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4130 Chromium-Molybdenum Steel Round Bar

4130 Chromium-Molybdenum Steel Round Bar: 4130 is a low-alloy chromium-molybdenum steel widely specified for fabricated structures, mechanical tubing and strength-related components. Weldability and heat-treating requirements must follow the product form and condition.

Download Mozaic 4130 Chromium-Molybdenum Steel Round Bar technical reference PDF

4130 Chromium-Molybdenum Steel Round Bar — Technical Overview

Grade-specific purchasing and reference details
Specification item Reference or order requirement
Grade or product 4130 Chromium-Molybdenum Steel Round Bar
Material designation / identity SAE/AISI 4130 / UNS G41300; Cr-Mo low-alloy steel
Specification to review ASTM A29/A29M or applicable tube/aircraft material specification
Delivery/heat-treatment condition Specify normalized, annealed or heat-treated condition
Examples of applications Machined shafts, fabricated tubes, fixtures and mechanical hardware
Quotation and inspection Provide OD, length, finished tolerance, surface finish and heat-lot documents

Engineering reference, not a mill test report. Actual chemistry, properties, condition, availability and qualification must meet the ordered product specification and accompanying certification.

Material Properties, Typical Parts and Selection

4130 has lower nominal carbon than 4140; hardenability and welding response differ. Representative applications include machined shafts, fabricated tubes, fixtures and mechanical hardware. Suitability depends on the environment, grade, geometry, strength/temper and processing route. Specify finished-size and material performance separately; two alloys with similar commercial names may have different test standards.

Precision Grinding, Straightening and Bar Finishing

Mozaic Precision Metals supports project-specific bar sourcing and centerless grinding, straightening, polishing, cutting, chamfering and packaging. Describe the incoming and finished OD, bar length, drawing requirements, production quantity and material traceability. Surface roughness, diameter tolerance and straightness are independent acceptance characteristics, and actual capability is confirmed by quote.

Related Grades and Application Alternatives

Common Buyer Questions

What condition must be specified for 4130 Chromium-Molybdenum Steel Round Bar?

Specify normalized, annealed or heat-treated condition. If the condition is not on the drawing, request the engineer’s confirmation before ordering or machining.

Are nearby grades automatic equivalents?

No. 4130 has lower nominal carbon than 4140; hardenability and welding response differ. Mechanical-property and chemical compliance must be verified against the applicable specification and mill certification.

Request a Quote

Email sales@mozaicprecision.com, call 847-637-8379, or request pricing and availability online.

The Advantages of Using 4130 Alloy Steel in Manufacturing and Construction

4130 alloy steel is a chromium-molybdenum low-alloy steel widely valued in both manufacturing and construction. Known for its balance of strength, toughness, and workability, 4130 round bar has become a preferred choice for industries requiring lightweight yet durable materials.

Key Advantages of 4130 Alloy Steel

  • High Strength-to-Weight Ratio: Provides durability without unnecessary weight, making it ideal for aerospace, automotive, and structural applications where weight reduction is critical.
  • Corrosion & Oxidation Resistance: Chromium and molybdenum content improve resistance to corrosive environments, extending component lifespan and reducing maintenance costs.
  • Excellent Weldability & Machinability: Easily welded into complex structures and machined to tight tolerances, ensuring precision in manufacturing processes.
  • Cost-Effective: Offers performance comparable to higher-cost alloys at a more economical price, making it a popular choice for large-scale projects.
  • Versatility: Used in a wide range of industries—from structural frameworks and construction equipment to aircraft components and performance vehicles.

Applications of 4130 Alloy Steel

Because of its strength, toughness, and adaptability, 4130 alloy steel is commonly used for:

  • Aerospace parts, including fuselage structures and landing gear
  • Automotive components, such as roll cages and performance parts
  • Construction frameworks, bridges, and machinery
  • Oil & gas equipment exposed to stress and corrosive environments
  • General manufacturing of shafts, fasteners, and precision parts

4130 Round Bar from Mozaic Precision Metals

At Mozaic Precision Metals, we supply precision-ground 4130 round bar stock designed to meet the most demanding industrial requirements. With over 60 years of combined leadership experience in precision grinding, our team ensures reliable quality, tight tolerances, and superior performance in every order.

Looking for 4130 alloy steel for your next project? Request a custom quote today and partner with Mozaic Precision Metals for proven alloy steel solutions.

4130 Round Bar Stock – Reliable Alloy Steel for Demanding Applications

Mozaic Precision Metals supplies 4130 alloy steel round bar, a high-strength, low-alloy material designed for toughness, durability, and versatility. With a unique balance of chromium and molybdenum, 4130 steel offers performance advantages that standard carbon steels cannot match, making it a trusted choice across aerospace, automotive, and industrial applications.

Why Choose 4130 Alloy Steel?

4130 round bar is valued for its superior strength-to-weight ratio, weldability, and heat-treating response. Its mechanical properties can be enhanced through thermal treatment, providing a wide range of hardness, strength, and ductility levels to fit specific project requirements.

Key Benefits of 4130 Round Bar

  • High Strength and Toughness: Withstands heavy stress and impact in demanding applications.
  • Heat Treatable: Can be quenched and tempered for improved hardness and mechanical performance.
  • Excellent Machinability and Weldability: Processes easily for custom components without compromising durability.
  • Versatile Applications: Trusted in industries that demand reliable, high-strength alloy steels.

Applications of 4130 Round Bar Stock

Mozaic Precision Metals supplies 4130 steel for a wide range of uses, including:

  • Aerospace structural components
  • Automotive parts such as shafts, axles, and gears
  • Oil and gas drilling equipment
  • Heavy machinery and tooling
  • Motorsports and performance equipment

Why Source 4130 Steel from Mozaic Precision Metals?

At Mozaic Precision Metals, we go beyond supplying steel—we provide solutions. With over 60 years of combined leadership experience in alloy steels and precision grinding, we ensure every 4130 round bar meets strict quality standards. Our team is dedicated to helping you select the right material for your project, with tailored services including cutting, grinding, and heat treatment available.

Contact Mozaic Precision Metals today to request a quote for 4130 round bar stock and get the high-performance materials you need to drive your business forward.