42CrMo Alloy Steel Bar - High-Strength Quenched & Tempered Round Bar

Technical Specifications of 42CrMo Alloy Steel Bar

42CrMo Alloy Steel Bar - High-Strength Quenched & Tempered Round Bar

42CrMo alloy steel bar represents a premium-grade low-alloy structural steel extensively employed in applications demanding exceptional mechanical strength and superior toughness. This chromium-molybdenum alloy steel finds critical roles in manufacturing heavy-duty machinery components, automotive transmission shafts, and high-stress engineering parts where resistance to fatigue and impact loads is paramount. Designed for manufacturers, distributors, and engineering procurement teams, our mill-direct 42CrMo round bars deliver consistent metallurgical properties meeting international quality standards.

What is 42CrMo Alloy Steel Bar?

42CrMo alloy steel bar is a medium-carbon chromium-molybdenum structural steel containing approximately 0.38-0.45% carbon, 0.90-1.20% chromium, and 0.15-0.25% molybdenum. This composition provides outstanding hardenability and mechanical properties after quenching and tempering heat treatment, achieving tensile strength of 1080 MPa minimum and yield strength of 930 MPa minimum per GB/T 3077 standards.

42CrMo Alloy Steel Bar Technical Specifications

Our 42CrMo round bars comply with GB/T 3077-2015 standards with precise chemical composition: C 0.38-0.45%, Si 0.17-0.37%, Mn 0.50-0.80%, Cr 0.90-1.20%, Mo 0.15-0.25%, P ≤0.035%, S ≤0.035%. Available in hot-rolled, forged, and cold-drawn conditions with diameters ranging from 10mm to 350mm, these bars undergo strict ultrasonic testing per GB/T 6402 to ensure internal soundness and freedom from critical defects.

Why Choose Our 42CrMo Alloy Steel Bars

We maintain factory-competitive pricing through direct mill partnerships while guaranteeing material traceability with complete mill test certificates per EN 10204 3.1 documentation. Our inventory management system enables rapid delivery of standard sizes within 7-10 working days, with custom heat treatment services including normalizing, quenching, and tempering to achieve specific hardness requirements ranging from 28-32 HRC for machining stock to 38-42 HRC for finished components.

Frequently Asked Questions

What is the minimum order quantity (MOQ)?

Our standard MOQ is 5 metric tons per specification for stock sizes. For custom diameters or heat-treated conditions, the minimum is 10 metric tons. We offer flexible quantity options for distributors establishing long-term supply agreements with quarterly contracts.

Do you provide material test certificates?

Yes, we supply comprehensive mill test certificates conforming to EN 10204 3.1 standards with every shipment. Documentation includes chemical composition analysis, mechanical properties testing results, heat treatment records, and ultrasonic inspection reports verified by third-party inspection agencies upon request.

What is the typical delivery time?

Standard diameter bars (16mm-100mm) in hot-rolled condition ship within 7-10 working days ex-works. Custom sizes requiring special rolling or heat treatment typically require 25-30 days. Expedited production is available for urgent projects with 15-day lead times at premium rates.

Can you cut to custom sizes?

Absolutely. Our precision cutting services accommodate lengths from 500mm to 6000mm with tolerance of ±5mm. We provide saw cutting, flame cutting, and machining services including turning, drilling, and milling to customer drawings. Cut pieces are deburred and marked with heat number for full traceability.

Get a Competitive Quote for 42CrMo Alloy Steel Bar

Request your customized quotation today by contacting our technical sales team with your specification requirements including diameter, length, quantity, heat treatment condition, and delivery destination. Our metallurgical engineers provide complimentary material selection consultation to optimize your component performance while achieving cost-effective procurement. We support global shipping with experience in export documentation, container loading optimization, and logistics coordination to over 45 countries across North America, Europe, Southeast Asia, and the Middle East.