Seamless TP321H Stainless Steel Pipe

Mechanical Properties

Applications

The addition of titanium makes 321H more suitable for high-temperature applications, and 304 sensitization reaction and 304L high-temperature strength insufficient applications. 

Typical applications include:

• Aircraft exhaust manifolds

• Expansion joints

• Bellows

• Furnace parts

• Heating element tubing

• Heat Exchangers

• Woven or welded screens for high temperature mineral processing

• Spiral Welded tube for burner pipes and flues

Service

Testing

• EN 10204/3.1B, EN 10204 3.1 and EN 10204 3.2 Material Test Certificates (MTC)

• Raw Materials Certificate

• 100% Radiography Test Report

• 100% PMI

• Heat Treatment Charts

• Third Party Inspection Report

• Surface roughness and size measurement

• Manufacturer Test Certificate( Impact Testing, Flatten, Spin,Curve, Hardness, Intergranular ,Point corrosions, Grain size, ET,UT, HT...)

• Laboratory Test Certificate from Govt. Approved Lab

• ......

End of Pipe and Tube

• BE : Beveled end

• BBE : Bevel both ends

• BLE : Bevel large end

• BSE : Bevel small end

• TOE / POE = Treaded One End / Plain One End

• TOE / BOE = Treaded One End / Beveled One End

• POE / BOE = Plain One End / Beveled One End

• TBE = Treaded Both Ends

• PBE = Plain Both Ends

Packing

• Ply Wooden Boxes

• PE Fabric Bundles

• Standard seaworthy export packing

• Plastic Bags, or as required

Marking

• Supplier / Manufacturer Name or Custom Logo - on request

• Specification

• Material Grade

• Nominal Size

• Schedule or Wall Thickness

• Method of Manufacturing (Seamless or Welded)

• Heat Number

Marked Pipe Sample: XTD ASTM A312  TP321 SEAMLESS 42.2x 3.56*6000MM HEAT NO. 2023121205A15

Material Summary

Stainless steel 321H (UNS S32109) is a type of  Ni-Cr-Ti heat resistant steel used for high-temperature environments. It offers excellent stress rupture and creeps resistance performance than that of 304 stainless steel. 321H SS pipes are available in both seamless and welded form in various sizes. Stainless Steel 321/321H seamless & welded pipes and tubes can be offered in random lengths, varied types and various forms used in manufacturing heat exchangers, pressure vessels, pharmaceuticals and chemical processing equipment.

321H Stainless steel Pipe is the higher carbon (0.04 - 0.10) version of the alloy. It was developed for enhanced creep resistance and for higher strength at temperatures above 1000oF (537°C). In most instances, the carbon content of the pipe enables dual certification.

Grade 321 is the grade of choice for applications in the temperature range of up to about 900°C, combining high strength, resistance to scaling and phase stability with resistance to subsequent aqueous corrosion.

Grade 321H is a modification of 321 with a higher carbon content, to provide improved high temperature strength.

Like other austenitic grades, 321 have excellent forming and welding characteristics, are readily brake or roll formed and have outstanding welding characteristics. Post-weld annealing is not required. They also have excellent toughness, even down to cryogenic temperatures. Grade 321 does not polish well, so is not recommended for decorative applications.

Grade 304L is more readily available in most product forms, and so is generally used in preference to 321 if the requirement is simply for resistance to intergranular corrosion after welding. However 304L has lower hot strength than 321 and so is not the best choice if the requirement is resistance to an operating environment over about 500°C.