ASTM A789/A789m Seamless Stainless Steel Tubes for Industry

• Customization: Available
• Application: Chemical Industry, Oil and Gas Industry, Building Material
• Certification: CE, ISO9001
• Model NO.: ASTM A789/A789M Seamless Stainless Steel Tubes
• Length: Max 50m
• Material: A270
• Outer Diameter: 3.18-810mm
• Type: Seamless Pipe
• Wall Thickness: 0.2-40mm
• Steel Grade: A480/1016/A789/S31803/S32205/S32750
• Technique: Hot Rolled/Cold Drawn
• Shape: Round/Customized
• Process: Polished/Solution Treatment
• Condition: Hot Finished/Cold Finished
• End: Plain End/Bevel End
• Usage: Heat Transfer
• Test: BV, SGS Is Available
• Stock: Size Can Customized
• Processing: Customized
• Thickness: 1-150mm
• Used: Factory, Decoration, Food
• Packing: Standard Export Packing
• Delivery Time: 10-30 Working Days
• Size: 1/4"-4"/Custom
• Transport Package: Woven Bag/Wooden Case
• Specification: SCH 5S-SCH160
• Trademark: EZS
• Origin: China
• Production Capacity: 10000 Kgs/Year

Product Description

Product Description

Dimensions & Tolerances

• Outer Diameter (OD):
  • Seamless tubes: 1/8" to 12" (imperial) or 6 mm to 325 mm (metric), per ASTM A403/A403m.
• Wall Thickness:
  • Specified by exact measurement (e.g., 0.065" to 1.000" or 1.65 mm to 25.4 mm) rather than schedule numbers.
• Lengths:
  • Random (3-7 m), cut-to-length, or custom (e.g., 6 m standard for heat exchangers).
• Tolerances:
  • OD: ±1% (for OD ≤ 12") or ±0.010" (for OD > 12"); wall thickness: ±10% (ASTM A789 Table 2).

ASTM A789/A789M:

• This standard covers the manufacturing requirements for stainless steel and other austenitic stainless steel straight and spiral seam pipes.
• Pipes are typically used under general service conditions and are suitable for general corrosive environments and low or high-temperature service
• This standard covers the manufacturing requirements for duplex (austenitic-ferritic) stainless steel seamless and welded pipe.
• Pipes are usually used in high-temperature, high-pressure, or corrosive environments with higher corrosion resistance and mechanical strength.

The key differences are the type of material and application area of the pipe. ASTM A789/A789M generally covers austenitic stainless steels and applications under general service conditions, while ASTM A790/A790M covers duplex stainless steels and more severe service environments and requirements. The choice of which standard to use depends on the specific project's needs, including required pipe material properties, working environment conditions, and budget, among other factors. You can contact us directly to answer your questions.

 

Characteristic	Details
Scope	Covers seamless tubes (hot-finished or cold-worked) and welded tubes (with or without post-weld heat treatment).
Alloy Grades	Austenitic stainless steels (e.g., 304, 304L, 316, 316L, 321, 347) per ASTM A959 chemical composition.
Manufacturing Methods	Seamless: Hot-pierced, cold-drawn, or cold-extruded; Welded: ERW (Electric Resistance Welded) with optional annealing.
Standards Compliance	Compatible with ASME SA789, API 5L, and various international codes (e.g., EN 10216-5 for pressure purposes).

Chemical Composition (Example Grades)

Grade	Chromium (Cr)	Nickel (Ni)	Molybdenum (Mo)	Carbon (C) Max.	Other Elements
304	18-20%	8-10.5%	-	0.08%	-
316L	16-18%	10-14%	2.0-3.0%	0.03%	-
321	17-19%	9-12%	-	0.08%	Ti (5×C-0.70%)

Mechanical Properties (Seamless Tubes, Annealed)

Property	304	316L	321
Tensile Strength	≥ 515 MPa	≥ 485 MPa	≥ 515 MPa
Yield Strength	≥ 205 MPa	≥ 170 MPa	≥ 205 MPa
Elongation	≥ 30%	≥ 30%	≥ 30%
Hardness (HB)	≤ 217	≤ 217	≤ 217

Manufacturing & Heat Treatment

1. Seamless Process:
   • Hot Piercing: Billets heated to 1100-1200°C, pierced by a mandrel to form a hollow shell.
   • Cold Working: Drawn through dies to refine OD and wall thickness (e.g., cold-drawn, cold-extruded).
   • Heat Treatment: Solution annealing (1010-1120°C, water-quenched) to restore austenitic structure and corrosion resistance.
2. Welded Tubes (not covered here but relevant to standard):
   • ERW with weld bead removal; optional post-weld annealing for critical applications.

Surface Finishes & Testing

• Mill Finish (AP): Annealed and pickled, suitable for general industrial use.
• Bright Annealed (BA): Smooth surface via controlled atmosphere annealing (sanitary applications).
• Testing Requirements:
  • Hydrostatic Test: 1.5× design pressure for 5 seconds (or non-destructive eddy current/ultrasonic test).
  • Flattening & Flaring Tests: Ensure formability for bending or fitting connections.
  • Intergranular Corrosion Test (Optional): ASTM A262 Practice E/F for sensitization resistance (critical in chemical processing).