ASTM A554 specification covers welded stainless steel tubing for mechanical applications where the appearance, mechanical properties, or corrosion resistance is needed.
MT 304 304L 316 316L 309S 310S 317L 321 347 are some common steel grades of ASTM A554.
|
Grade |
MT304 |
MT304L |
MT316 |
MT316L |
|
C |
≤0.08% |
≤0.03% |
≤0.08% |
≤0.03% |
|
Mn |
≤2% |
≤2% |
≤2% |
≤2% |
|
Si |
≤1% |
≤1% |
≤1% |
≤1% |
|
P |
≤0.045% |
≤0.045% |
≤0.045% |
≤0.045% |
|
S |
≤0.03% |
≤0.03% |
≤0.03% |
≤0.03% |
|
Cr |
18-20% |
18-20% |
16-18% |
16-18% |
|
Ni |
8-10.5% |
8-12% |
10-14% |
10-14% |
|
Mo |
- |
- |
2-3% |
2-3% |
|
Grade |
MT309S |
MT310S |
MT317L |
MT321 |
MT347 |
|
C |
≤0.08% |
≤0.08% |
≤0.03% |
≤0.08% |
≤0.08% |
|
Mn |
≤2% |
≤2% |
≤2% |
≤2% |
≤2% |
|
Si |
≤1% |
≤1.5% |
≤1% |
≤1% |
≤1% |
|
P |
≤0.045% |
≤0.045% |
≤0.045% |
≤0.045% |
≤0.045% |
|
S |
≤0.03% |
≤0.03% |
≤0.03% |
≤0.03% |
≤0.03% |
|
Cr |
22-24% |
24-26% |
18-20% |
17-19% |
17-19% |
|
Ni |
12-15% |
19-22% |
11-15% |
9-12% |
9-13% |
|
Mo |
- |
- |
3-4% |
- |
- |
|
Ti |
- |
- |
- |
≥5x(C + N) and ≤0.70% |
- |
|
Nb |
- |
- |
- |
- |
10xC – 1.0% |
|
Property |
304 |
304L |
316 |
316L |
|
Density (g/cm³) |
7.93 |
7.93 |
7.99 |
7.99 |
|
Modulus of Elasticity (GPa) |
200 |
200 |
193 |
193 |
|
Thermal Conductivity (W/m-K) |
16.2 |
16.2 |
16.3 |
16.3 |
|
Specific Heat Capacity (J/kg-K) |
500 |
500 |
500 |
500 |
|
Coefficient of Thermal Expansion (x 10^-6/°C) (32-100°C) |
17.2 |
17.2 |
15.9 |
15.9 |
|
Electrical Resistivity (Ω-m) |
72 x 10^-8 |
72 x 10^-8 |
74 x 10^-8 |
74 x 10^-8 |
|
Property |
MT309S |
MT310S |
MT317L |
MT321 |
MT347 |
|
Density (g/cm³) |
7.9 |
7.9 |
7.99 |
7.92 |
7.96 |
|
Modulus of Elasticity (GPa) |
200 |
200 |
193 |
200 |
193 |
|
Thermal Conductivity (W/m-K) |
15 (approx) |
14.2 |
16.2 |
16.1 |
16.3 |
|
Specific Heat Capacity (J/kg-K) |
500 |
500 |
500 |
500 |
500 |
|
Coefficient of Thermal Expansion (x 10^-6/°C) (32-100°C) |
17 |
16 |
16 |
16.6 |
16 |
|
Electrical Resistivity (Ω-m) |
80 x 10^-8 (approx) |
78 x 10^-8 |
74 x 10^-8 |
72 x 10^-8 |
73 x 10^-8 |
|
Grade |
Tensile Strength (MPa) |
Yield Strength (MPa) |
Elongation (%) |
|
MT304 |
515 (min) [~75,000 psi] |
205 (min) [~30,000 psi] |
40% (min) |
|
MT304L |
485 (min) [~70,000 psi] |
170 (min) [~25,000 psi] |
40% (min) |
|
MT316 |
515 (min) [~75,000 psi] |
205 (min) [~30,000 psi] |
40% (min) |
|
MT316L |
485 (min) [~70,000 psi] |
170 (min) [~25,000 psi] |
40% (min) |
|
Grade |
Tensile Strength (MPa) |
Yield Strength (MPa) |
Elongation (%) |
|
MT309S |
620 (approx) [~90,000 psi] |
310 (approx) [~45,000 psi] |
40% (min) |
|
MT310S |
620 (approx) [~90,000 psi] |
310 (approx) [~45,000 psi] |
40% (min) |
|
MT317L |
515 (min) [~75,000 psi] |
205 (min) [~30,000 psi] |
40% (min) |
|
MT321 |
515 (min) [~75,000 psi] |
205 (min) [~30,000 psi] |
40% (min) |
|
MT347 |
515 (min) [~75,000 psi] |
205 (min) [~30,000 psi] |
40% (min) |
Material Grades: ASTM A554 includes several material grades, such as 304, 304L, 316, 316L, and others. These grades have different chemical compositions and properties to suit various applications.
Welding: The tubing is produced by welding stainless steel strips into tubes. The welding process ensures the tubing's structural integrity.
Size Range: ASTM A554 tubing comes in a wide range of sizes and shapes, including round, square, rectangular, and special shapes. The tubing sizes are specified by outside diameter and wall thickness.
Surface Finish: A significant characteristic of ASTM A554 tubing is its surface finish. These tubes are often polished to achieve a smooth, aesthetically pleasing appearance. Different surface finishes are available, including mill finish, 180-grit, 320-grit, and others.
Tolerances: The standard specifies tolerances for dimensions, wall thickness, and straightness to ensure consistency and quality.
Applications: ASTM A554 stainless steel tubing is commonly used for architectural and decorative purposes, such as handrails, balustrades, furniture, and other ornamental applications. It is also suitable for structural applications where corrosion resistance is required.
Corrosion Resistance: Stainless steel, in general, is known for its excellent corrosion resistance properties. The grades specified in ASTM A554 offer good resistance to corrosion, making them suitable for both indoor and outdoor applications.
Mechanical Properties: The mechanical properties, including tensile strength, yield strength, and elongation, may vary depending on the specific stainless steel grade used. However, these properties are typically sufficient for the intended decorative and structural purposes.
Heat Treatment: ASTM A554 tubing is usually delivered in the annealed condition, making it suitable for cold forming and bending without risk of cracking.
Certification: Tubing that complies with ASTM A554 typically comes with material test reports (MTRs) to verify its chemical composition and mechanical properties.
HYT supplies ASTM A554 TP304/304L, TP316/316L Welded Stainless Steel Tubing.
Standard: SUS, JIS, AISI, ASTM, GB, DIN, EN
Shape: round, square, rectangular, or special
Size Range: ½" to 8" Dia
Wall Thickness: 0.049" to 0.375"
Manufacturing Type: Seamless / ERW / Welded / Fabricated / CDW / CDS / DOM / CEW / 100% X Ray Welded
Surface Finish: Polished 180 grit, polished 320 grit, Mill finish
Our extensive inventory at HYT covers A554 in multiple different forms and all grades. To find out more about how we can assist with your specific application, please contact us to receive a custom quote and to learn more about our shipping and pick-up options.
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