SA312 Smls Pipes Tp321/Tp347/Tp405/Tp410 Stainless Steel Tube Electric Power/Chemical Industry

• Customization: Available
• Application: Automotive Industry, Chemical Industry, Food Industry, Oil and Gas Industry, Pharmaceutical Industry
• Certification: CE, ISO9001
• Model NO.: SA312 SMLS Pipes SSTP321/TP347/TP405/TP410 Tubes
• Length: 1-50m
• Material: SA213/A249/A269/A312/A358
• Outer Diameter: 3.18-810mm
• Type: Seamless Pipe
• Wall Thickness: 0.2-40mm
• Steel Grade: SA213 Tp321/Tp347/Tp405/Tp410
• 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"
• Transport Package: Woven Bag/Wooden Case
• Specification: SCH 5S-SCH160
• Trademark: EZS
• Origin: China
• Production Capacity: 10, 000, 000 Kgs/Year

Product Description

Product Description

  

ASTM/ASME SA312 Seamless Pipes & Tubes (SSTP321, TP347, TP405, TP410)

 

1. Material Overview

• Standard: ASTM A312/ASME SA312 specifies seamless and welded austenitic stainless steel pipes/tubes for high-temperature and corrosive service.

• Grades Covered:

  • TP321 (UNS S32100): Titanium-stabilized austenitic steel for high-temperature corrosion resistance.

  • TP347 (UNS S34700): Niobium-stabilized austenitic steel for superior creep resistance.

  • TP405 (UNS S40500): Ferritic stainless steel with 12% Cr, designed for moderate corrosion resistance and weldability.

  • TP410 (UNS S41000): Martensitic stainless steel with 12% Cr, offering high strength and wear resistance.

 

2. Key Properties

Chemical Composition (Typical %)

Element	TP321	TP347	TP405	TP410
Chromium	17-19	17-20	11.5-14.5	11.5-13.5
Nickel	9-12	9-13	≤0.60	≤1.0
Titanium	5×C-0.70	-	-	-
Niobium	-	10×C-1.0	-	-
Carbon	≤0.08	≤0.08	≤0.08	0.08-0.15

Mechanical Properties

Grade	Tensile Strength (MPa)	Yield Strength (MPa)	Elongation (%)	Hardness (HRB)
TP321	≥515	≥205	≥35	≤90
TP347	≥515	≥205	≥35	≤90
TP405	≥415	≥205	≥20	≤80
TP410	≥515	≥275	≥20	≤25 (HRC)

Temperature & Corrosion Resistance

• TP321:

  • Titanium stabilization prevents carbide precipitation during welding.

  • Resists oxidation up to 800°C; ideal for exhaust systems, thermal processors.

• TP347:

  • Niobium stabilization enhances creep resistance (up to 900°C).

  • Used in boilers, superheaters, and refinery furnaces.

• TP405:

  • Ferritic structure with moderate corrosion resistance (e.g., mild acids, freshwater).

  • Limited high-temperature performance; max service temp ~400°C.

• TP410:

  • Martensitic steel with high strength but limited corrosion resistance.

  • Suitable for mechanical parts (valves, pumps) in mildly corrosive environments.

 

3. Manufacturing Process

• Seamless Production:

  • TP321/TP347: Hot extrusion or cold drawing followed by solution annealing (e.g., 1040-1120°C) to dissolve carbides.

  • TP405/TP410: Ferritic/martensitic grades require controlled cooling and tempering (for TP410) to optimize strength and ductility.

• Surface Finish: Pickling, passivation, or polishing per ASTM A480.

• Testing: Hydrostatic testing, NDT (UT/ET), hardness testing (TP410).

 

4. Applications

• TP321:

  • Aircraft exhaust systems, heat exchangers, chemical processing equipment.

• TP347:

  • Power plant boilers, superheater tubes, ethylene cracker furnaces.

• TP405:

  • Automotive exhaust components, heat recovery systems, water heaters.

• TP410:

  • Pump shafts, valve trim, fasteners, and turbine blades.

 

5. Standards & Certifications

• Complies with ASME SA312 (TP321/TP347) and ASTM A268 (TP405/TP410).

• Certifications: NACE MR0175 (for sour service), PED 2014/68/EU, and EN 10204-3.1.

 

6. Key Differences & Selection Guide

Grade	Structure	Strengths	Limitations
TP321	Austenitic	High-temp stability, weldability	Higher cost vs. TP304
TP347	Austenitic	Creep resistance, oxidation	Not ideal for chloride exposure
TP405	Ferritic	Cost-effective, weldable	Low corrosion resistance
TP410	Martensitic	High strength, wear resistance	Poor corrosion resistance

 

Detailed Photos