Products

DESCRIPTION

• Overview
• Product Description
• Specification
• After Sales Service
• Company Profile
• Certifications
• Packaging & Shipping
• FAQ

Overview

Basic Info.

Model NO.	AISI 4140 Steel Round Bar
Technique	Hot Rolled
Application	Structural Steel Bar, Tool Steel Bar, Die Steel Bar
Surface Treatment	Polished
Alloy	Alloy
Special Use	Mold Steel, Free Cutting Steel, Cold Heading Steel
Product Name	AISI 4140 Steel Round Bar
Size	6-300mm
Length	1m-9m
Grade	Grade B/X42/X52/X60/X70 L245/L290/S320/L360/L390
Applications	Thermal Heating Factories, Petrochemical
Transport Package	International Standards
Specification	Standard Specifications or Customized
Trademark	CHANGCHENG
Origin	Jiangsu, China
Production Capacity	300000tons/Year

Product Description

Product DescriptionPREMIUM 42CrMo (AISI 4140 42CrMo4 SCM440 42CrMoA) ALLOY STEEL ROUND BAROur 42CrMo steel round bar, equivalent to AISI 4140, SAE 4140, EN 42CrMo4 (1.7225) and JIS SCM440, is a premium chromium-molybdenum alloy steel renowned for its exceptional strength, toughness, and versatility.Equivalent Foreign Grades • EN: 42CrMo4 (1.7225)
• AISI/SAE: 4140
• JIS: SCM440
• Executive Standard: GB/T 3077-2015

Chemical Composition (Mass Fraction %)

Element	Content Range
C (Carbon)	0.38 - 0.45
Si (Silicon)	0.17 - 0.37
Mn (Manganese)	0.50 - 0.90
Cr (Chromium)	0.90 - 1.20
Mo (Molybdenum)	0.15 - 0.25
P (Phosphorus)	≤ 0.02
S (Sulfur)	≤ 0.02

Specification

Item	Details
Product Name	AISI 4140/42CrMo4/SCM440/42CrMoA Alloy Steel Round Bar
Size	Ø 6-600mm (custom sizes available upon request)
Length	1m - 9m (custom lengths available upon request)
Technique	Hot Rolled (forged, cold drawn options available)
Standard	DIN, EN, GB, ISO, JIS, BA, ANSI

Professional ManufacturerHigh-quality Products And Professional, Efficient And Thoughtful Services

Main ProductsCore Product AdvantagesProduct Application FieldsWe professionally supply premium 42CrMo (AISI 4140 42CrMo4 SCM440 42CrMoA) steel round bars with genuine materials, stable performance, complete specifications and sufficient stock. We support non-standard customization and various deep processing services.Sufficient ready stock and complete specifications with a wide range of conventional diameters, enabling fast order response and timely delivery.One-stop deep processing services integrating fixed-length cutting, heat treatment and CNC rough turning, eliminating the need for secondary outsourcing to save time and effort.High dimensional accuracy and uniform & stable heat treatment performance to meet various machining and finished parts manufacturing requirements.100% spectral inspection for incoming raw materials, full-process quality control, material certificates provided upon delivery, and third-party re-inspection supported.Customized production according to drawings, samples and performance requirements, accepting both small and large batch orders with guaranteed delivery time.Our products are widely used in machinery manufacturing, auto parts, transmission shafts, gears, fasteners, molds, mining equipment, construction machinery, wind power equipment and other industries. Corresponding materials can be selected according to different working conditions to meet the processing requirements of various stress parts, structural parts and wear-resistant parts.After Sales ServiceFixed-length CuttingHeat TreatmentCNC Rough TurningProcessing equipment: CNC sawing machines, high-speed band sawing machines, providing burr-free cutting and flat sections.Processing scope: fixed-length cutting of any length, segmented cutting, non-standard size cutting.Processing accuracy: length tolerance ±0.5mm, end perpendicularity ≤0.5°.Advantages: precise cutting size without secondary processing, suitable for subsequent heat treatment and rough turning processes.Processing types: quenching and tempering (quenching + high-temperature tempering), quenching, annealing, normalizing, vacuum heat treatment.Inspection standards: hardness up to required HRC/HB, internal stress relieved, improving product strength, toughness and wear resistance.Application scenarios: optimizing mechanical properties of round bars to meet load-bearing, wear-resistant, high-temperature resistant requirements of parts.Processing equipment: CNC lathes, common horizontal lathes.Processing scope: outer ring turning, end face turning, chamfering, step processing.Processing accuracy: diameter tolerance ±0.1mm, surface roughness Ra3.2–Ra6.3.Advantages: precise turning dimensions, smooth and defect-free surface, ready for direct finish machining.Customization ServicesQuotation ServiceWe support customers to provide drawings, samples and processing requirements, and develop customized processing solutions on a one-to-one basis. Production starts only after drawing confirmation. As a direct factory supplier, we ensure genuine materials and qualified accuracy, with fast delivery for customized orders. Focused on deep processing of various round steel materials, we eliminate multiple outsourcing procedures to save costs and shorten the construction period, meeting parts processing demands in multiple fields.For quotation requests, please provide round steel material, specifications, processing requirements and purchase quantity. New and existing customers are welcome to call for consultation, send drawings for quotation, or visit our factory. Samples and material inspection reports are available free of charge, and we will provide an accurate quotation.Company Profile

Production & Quality Inspection ProcessRaw material procurement → Spectral inspection & testing → Cutting & blanking → Dimensional re-inspection → Heat treatment → Hardness testing → Rough & finish turning → Full dimensional inspection → Rust-proof packaging → Warehousing & deliveryEach process is supervised by professional quality inspectors equipped with hardness testers, calipers, spectrometers and other professional testing equipment to prevent unqualified products from leaving the factory, with full traceability of quality.

Certifications

Packaging & Shipping

1. Products are packaged with moisture-proof and rust-proof materials, firmly strapped and palletized to avoid collision and rust during transportation, ensuring intact delivery.
2. Long-term cooperation with professional logistics and freight companies for nationwide distribution and cross-border delivery to ensure safe arrival of goods.
3. Regular ready stock and processing orders: delivery within 3–7 days; delivery time for urgent orders can be shortened through negotiation with on-time delivery guaranteed.FAQ
Q1: Are you a factory or a trading company?
A: We are an integrated manufacturer with our own factory and trading team. Welcome to visit our factory at any time.

Q2: Can you support customized requirements?
A: We fully support on-demand customization, including material, specification, size, processing, and packaging customization to meet your project needs.

Q3: What payment terms do you accept?
A: We accept T/T, Western Union, PayPal, etc. Specific terms can be negotiated based on order volume.

Q4: What shipping methods do you offer?
A: We provide sea, air, and land transportation. We will recommend the most cost-effective solution based on your order volume and delivery time, or follow your designated shipping method.

Q5: How can I get an accurate quotation?
A: Please provide us with the material, specification, quantity, processing requirements, and other detailed information of the round bar, and we will offer you an accurate price and customized solution promptly.