JIS SUS 446 stainless is equivalent with Chinese grade of high chromium ferritic stainless steel 2Cr25N (16Cr25N), American standard is named[TJC STEEL] AISI/ASTM 446-1, UNS S44600, German standard EN/DIN 1.4749, X18CrN28, etc.

 

AISI 446’s Main Chemical Components are(%):

C 0.20, Si 1.00, Mn 1.50, S 0.030, P 0.040,[TJC STEEL] Cr 23.0-27.0, Cu 0.30, N 0.25.

 

AISI 446/2Cr25N is one kind of high chromium ferritic stainless steel, with high Cr content, better oxidation resistance than Cr13 and Cr18 types[TJC STEEL] of ferritic stainless steel, especially suitable for use under the condition of temperature fluctuation. It can make all kinds of heat-resistant components under load conditions of more than 950. Because of the ferrite arrangement of this type of steel, martensite arrangement is not obtained during quenching. Due to about 600 ℃ adjacent slow cooling, it is to separate after alpha brittle, so, when annealing o from 78 ~ 880 ℃ air cooling is necessary due to the high temperature oxidation resistance good, so, using the heat-resistant parts under 1100 ℃ (plate), and the characteristics of high sulfur gas corrosion resistance function, used in the heating box, nozzle, family use oil heater combustion chamber and other parts.

 

AISI 446/SUS 446/2Cr25N, TP446-1 stainless steel seamless tube process route: non-vacuum smelting - round ingot - ingot peeling -[TJC STEEL] forging tube billet - air cooling - equipment extrusion billet - extrusion - water quenching - annealing - inspection - straightening - pickling - storage conditions:

 

Yield Strength σ0.2 (MPa) : ≥275

 

Elongation δ5 (%) : ≥20

 

Section Shrinkage ψ (%) : ≥40

 

Hardness: 201 hb or less[TJC STEEL]

 

 

Heat Treatment Specification and Metallographic Organization of AISI 446/ SUS 446/ UNS S44600:

Heat treatment specification: anneal 780 ~ 880℃ quick cooling;

Metallographic structure:[TJC STEEL] The structure is characterized by ferritic shape.

 

 

The Delivery Status of AISI 446/ SUS 446/ UNS S44600 Stainless:

Delivery shall be in the standard[TJC STEEL] state of heat treatment, and the type of heat treatment shall be indicated in the contract; If not specified, the goods shall be delivered without heat treatment.