ASTM A984 Gr.35 Black Electric-Resistance-Welded Steel Tube For Building
ASTM A984 Gr.35 Gr.50 Gr.60 Gr.70 Gr.80 Welded Steel Tube
Introduction
ASTM A984 is a specification that covers electric-resistance-welded (ERW) steel tubes used in various applications, particularly in construction and building materials. This specification includes several grades, each with distinct mechanical properties and chemical compositions. This article provides an overview of the specifications, chemical compositions, mechanical properties, and applications of ASTM A984 welded steel tubes.
Specification
ASTM A984 outlines the requirements for electric-resistance-welded steel tubes, including dimensions, tolerances, and testing methods. The specification is applicable to round, square, and rectangular tubes, which are commonly used in structural applications.
Chemical Composition
The following table presents the chemical composition for different grades of ASTM A984 welded steel tubes:
| Grade | Carbon (C) | Manganese (Mn) | Phosphorus (P) | Sulfur (S) | Silicon (Si) | Chromium (Cr) | Nickel (Ni) | Molybdenum (Mo) |
|---|---|---|---|---|---|---|---|---|
| Gr.35 | 0.18 max | 1.00 max | 0.04 max | 0.05 max | 0.40 max | 0.25 max | 0.25 max | 0.10 max |
| Gr.50 | 0.20 max | 1.20 max | 0.04 max | 0.05 max | 0.40 max | 0.30 max | 0.30 max | 0.10 max |
| Gr.60 | 0.23 max | 1.30 max | 0.04 max | 0.05 max | 0.40 max | 0.35 max | 0.35 max | 0.10 max |
| Gr.70 | 0.25 max | 1.40 max | 0.04 max | 0.05 max | 0.40 max | 0.40 max | 0.40 max | 0.10 max |
| Gr.80 | 0.28 max | 1.50 max | 0.04 max | 0.05 max | 0.40 max | 0.45 max | 0.45 max | 0.10 max |
Mechanical Properties
The following table summarizes the mechanical properties for different grades of ASTM A984 welded steel tubes:
| Grade | Yield Strength (ksi) | Tensile Strength (ksi) | Elongation (%) | Hardness (Rockwell B) |
|---|---|---|---|---|
| Gr.35 | 35 | 55-75 | 20 | 70-85 |
| Gr.50 | 50 | 65-85 | 20 | 70-85 |
| Gr.60 | 60 | 70-90 | 20 | 70-85 |
| Gr.70 | 70 | 75-95 | 20 | 70-85 |
| Gr.80 | 80 | 85-105 | 20 | 70-85 |
Application
ASTM A984 welded steel tubes are widely used in various applications, including:
- Construction: Structural support in buildings, bridges, and other infrastructure.
- Manufacturing: Components for machinery and equipment.
- Automotive: Parts for vehicles, including frames and chassis.
- Furniture: Framework for tables, chairs, and other furniture items.
- Pipelines: Transporting fluids and gases in industrial applications.
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