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About us
Tianjin lefin Industrial
TIANJIN LEFIN STEEL GROUP containing Tianjin lefin Industrial Co.,Ltd. 、Tianjin lefin steel import & export Co.,Ltd and Tianjin Shengqifeng International Trading Co., Ltd. -
Products
Steel Pipe Processing
Our main products include 1/2inch to 16 inch ERW PIPE/GI PIPE which has been produced according to BS1387/ASTM A53/EN10219/EN10255/EN10217 Standard -
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Service Capability
Guarantee Quality
Our steel pipes are suitable for oil, natural gas, shipbuilding, chemical industry, water conservancy, electrical, steel structure, construction and other related fields.
Our main products include 1/2inch to 16 inch ERW PIPE/GI PIPE which has been produced according to BS1387/ASTM A53/EN10219/EN10255/EN10217 Standard
Our main products include 1/2inch to 16 inch ERW PIPE/GI PIPE which has been produced according to BS1387/ASTM A53/EN10219/EN10255/EN10217 Standard
Has rich experience in steel pipe processing, can be customized according to customer requirements according to the drawing and sample processing, assist in the development of new products.
Tanzania ASTM A1085 HSS
Category:
Product Description
Scope And Purpose
Standard Title: Standard Specification for Cold-Formed Welded Carbon Steel Hollow Structural Sections (HSS)
Developed by: ASTM International (Subcommittee A01.09 on Structural Steel)
Primary Use: Structural applications requiring high strength, precision tolerances, and weldability.
Key Advantages Over A500:
Higher strength-to-weight ratio.
Improved dimensional consistency.
Better weldability and ductility for seismic and dynamic loading.
Chemical Composition
| The chemical composition of ASTM A1085 | |
| Element |
|
| Carbon (C), max | for heat analysis : 0.26% |
for product analysis : 0.30% | |
| Manganese (Mn), max | for heat analysis : 1.35% |
for product analysis : 1.40% | |
| Phosphorus (P), max | for heat analysis : 0.035% |
for product analysis : 0.045% | |
| Sulfur (S), max | for heat analysis : 0.035% |
for product analysis : 0.045% | |
| Aluminum(Al), min | for heat analysis: 0.015% acid soluble OR |
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| Silicon(Si), max | for heat analysis : 0.04% |
for product analysis : 0.07% | |
Notes: For each reduction of 0.01 percentage point below the specified maximum for carbon, an increase of 0.06 percentage point above the specified maximum for manganese is permitted, up to a maximum of 1.50% by heat analysis and 1.60% by product analysis.
Mechanical Properties
Property | ASTM A1085 Requirements |
|---|---|
| Yield Strength (min) | 50 ksi (345 MPa) – 70 ksi (485 MPa) |
| Tensile Strength (min) | 65 ksi (450 MPa) |
| Elongation (min, %) | 21% (depends on wall thickness) |
Notes: The minimum elongation values specified apply only to tests performed prior to shipment of the tubing.
Manufacturing Process
Cold Forming & Welding
Forming: Flat steel is roll-formed into round, square, or rectangular shapes.
Welding: High-frequency electric resistance welding (ERW) or laser welding ensures a seamless, high-strength joint.
Sizing & Shaping: Cold-worked to achieve tight tolerances (±0.5% on dimensions).
Impact Toughness (Charpy V-Notch)
Requires all HSS to meet a minimum Charpy V-notch value of 25 ft-lb at 40°F. This makes it suitable for structures subject to fatigue and low-temperature applications.
Applications
High-Rise Buildings: Lighter columns with higher load capacity.
Bridges: Improved fatigue resistance.
Seismic Zones: Better energy absorption during earthquakes.
Architectural Exposed Steel: Aesthetic appeal with structural integrity.
Conclusion
ASTM A1085 represents an advanced evolution of HSS standards, offering superior strength, precision, and weldability compared to older specs like A500. It is increasingly preferred in modern steel construction, particularly where seismic resilience, lightweight efficiency, and fabrication ease are critical.
Address: Hengtai Road,Daqiuzhuang Town,Jinghai County,Tianjin,China
Mob: +8615122229899(whatspp)
Phone: +86 22 58171905
Fax: +86 22 58171902
E-mail:info@lefinsteel.com
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