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Product Description

We supply 631 stainless steel bars, a semi-austenitic precipitation-hardening grade offering exceptional strength and corrosion resistance. Through controlled heat treatment, this material achieves tensile strengths exceeding 1300 MPa while maintaining good ductility and resistance to stress corrosion cracking, making it suitable for demanding structural and mechanical applications.
Core Features
Controlled Precipitation Hardening: Achieves precise strength levels through solution treatment followed by aging.
High Strength-to-Weight Ratio: Ideal for weight-sensitive applications where both strength and durability are required.
Good Corrosion Resistance: Provides better corrosion resistance than martensitic stainless steels, especially after proper heat treatment.
Excellent Fatigue and Elastic Properties: Suitable for high-cycle fatigue applications such as springs, fasteners, and high-stress components.
Applications
Aerospace fasteners and landing gear components, precision instrument parts, chemical processing valve stems, medical device springs, and high-performance mechanical linkages.
We offer round, square, and hexagonal bars in various sizes, with options for custom cutting, heat treatment conditioning, precision grinding, and surface finishing. Full material certification compliant with AMS 5644, ASTM A564, EN 10088-3, and related standards is provided to ensure quality and traceability.

Product Show

Crafted from premium austenitic, martensitic, and duplex grades (304, 316, 410, 2205, etc.), our stainless steel bars deliver exceptional corrosion resistance, high strength, and precise machining performance. Available in round, square, hexagonal, and flat shapes with hot-rolled or cold-finished surfaces, these bars comply with ASTM A276, A479, and international standards. Ideal for machining parts, automotive components, construction hardware, and industrial tools. Custom sizes and grades supported.


Manufactured using precision hot rolling and cold drawing processes, our stainless steel bars undergo controlled annealing and straightening to ensure uniform mechanical properties and dimensional stability. Equipped with laser micrometers (±0.05mm tolerance) and ultrasonic testing for defect detection, we guarantee consistent quality in round, square, hexagonal, and flat shapes. Compliant with ASTM A276/A479 and international standards. Custom sizes and material grades (304, 316, 410, 2205, etc.) are supported.


In order to ensure product quality, we will arrange professional personnel to check product quality, packaging, weight, hardness, etc., according to customer requirements of product specifications, looking for high-quality and cheap cooperative factories in China, to provide customers with one-stop procurement services and quality assurance.


Excellent packaging: waterproof paper and plastic film + iron cover + at least three strapping straps + strapping straps fixed on iron or wood pallets can effectively protect products from corrosion and various climate changes during transportation. Generally speaking, we ship from Shanghai, Tianjin, Qingdao and Ningbo ports. We have worked with many experienced shipping companies for a long time to find the most suitable mode of transportation for you.

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