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TP321H ,UNS S32100,1.4878,X8CrNiTi 18-10

Material No.

EN symbol 

X8CrNiTi 18-10




321 S 51



Alloy 321H (UNS S 32109) 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 plate enables dual certification.Stabilisation treatment: 1040-1100°C (1920-2010°F), 2-5 min rapid cooling in air or water. However, annealing above 1100°C (2010°F) may be required in order to meet grain size requirements. This treatment should be followed by a stabilisation treatment.
Chemical composition (%)

TP321H0.04- 5x%C max.0,60  
1.48780.1002.000.0450.0151.009.0-12.017.0-19.0 5x%C max.0,80  

Mechanical Properties:

GradeTensile StrengthYield Strength 0.2%Elongation -% in  50 mm (min.)HardnessHardness
ksi (min.)Offset ksi (min.)(Brinell) MAX(Rockwell B) MAX

Convert ksi to Mpa Formula:  ksi/0.1450377

Welding filler for welded pipe & tube

A 5.4  E321H   UNS W34710

Alloy 321/H can be easily welded and processed by standard shop fabrication practices.


Main fields of application(depending on the specific conditions of use)

Good resistance to hydrogen sulphide gas and intergranular corrosion coupled with good high temperature strength make 321 a suitable material for applications as tubes in heating furnaces and heat exchangers in sulphurisation and hydro-treating plants.

In the petrochemical industry the steel is used in cracking furnaces for the production of ethylene and vinyl chloride. It is also frequently used for heat exchangers and piping in the chemical and petrochemical

Aerospace – piston engine manifolds
Expansion Joints
Food Processing – equipment and storage
Petroleum Refining – polythionic acid service
Waste Treatment – thermal oxidizers