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standard & specification

High alloy: AISI TP439 / UNS S43035

AISI TP439 / UNS S43035 / EN 1.4510 / X3CrTi17

C≤ Si≤ Mn≤ P≤ S≤ Cr Ni
0.07 1 1 0.04 0.03 17-19 ≤0.5
Mo Al Cu Nb Ti V Ce
  ≤0.15     0.2+4*(C+N)~1.1    
N Co Pb B Other    


Ti= [4 * (C+N) + 0.15] to 0.80
Stabilisation may be by use of titanium or niobium or zirconium. According to the atomic mass of these elements and the content of carbon and nitrogen, the equivalence shall be the following: Nb (% by mass)=Zr (% by mass) = 7/4 Ti (% by mass)
Elements not listed in this table shall not be intentionally added to the steel without the agreement of the purchaser except for finishing the cast.
Particular ranges of sulphur content may provide improvement of particular properties. For machinability a controlled sulphur content of 0.015 % to 0.030% is recommended and permitted. For weld ability, a controlled sulphur content of 0.008 % to 0.030 % is recommended and permitted. For polishability, a controlled sulphur content of 0.015 % max is recommended.


· Automotive exhaust system parts: mufflers, pipes, catalytic converters, support parts.
· Domestic appliance internal parts Welding
· Conventional welding methods are applicable, austenitic 308L and ferritic 430LNb or 439 filler metals can be used.
· Austenitic filler metal will result in more a ductile weld.
· Ferritic filler metals are recommended to use in sulphuric environments and under thermal stresses.
· Shielding gases should be based on Ar/He, mixed with maximum of 2 % oxygen or carbon dioxide to improve the arc stability. Hydrogen and nitrogen additions are forbidden.
· Heat input should be minimized to reduce the grain coarsening effect in the heat-affected zone.
· Titanium stabilization prevents sensitization effect in the heat-affected zone.
· Adequate corrosion resistance in the welded joint is achieved using either mechanical descaling or picKLMing. Fabrication
· Grade 1.4510 can be formed using typical forming processes like folding, bending, drawing, etc.
· It has higher minimum proof strength than standard austenitic stainless steel grade 1.4301 / AISI 304 in combination with lower work hardening behavior.
· Due to the stabilization, the r-value is higher compared to the non-stabilized ferritic stainless steel such as 1.4016.
· These characteristics mean excellent deep-drawability and other forming related properties. Corrosion resistance
· Outokumpu produces grade 1.4510 with a typical chromium content of 17 wt-% .
· Titanium Alloying reduces sensitivity for intergranular corrosion.
· Oxidation resistance is good up to 950°C.
· Relatively high chromium content improves resistance to crevice corrosion
· Grade 1.4510 is not susceptible to chloride induced
stress corrosion cracking. · The best material performance is reached usually with the help of adequate design and regular cleaning during use (if applicable).

Grade Proof strength Rp0,2 (N/mm2) Tensile strength Rm (N/mm2) Elongation after fracture A (%)
EN  1.451 240 Min.  420…600  23 Min. 
AISI  439 205 Min.  415 Min.  22 Min. 
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