JIS SUS 446 stainless is equivalent with Chinese grade of high chromium ferritic stainless steel 2Cr25N (16Cr25N), American standard is named AISI/ASTM 446-1, [SCALE STEEL]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, 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 of ferritic stainless steel, especially suitable for use under the condition of temperature fluctuation. [SCALE STEEL]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, [SCALE STEEL]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 - forging[SCALE STEEL] 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
Heat Treatment Specification and Metallographic Organization of AISI 446/ SUS 446/ UNS S44600:
Heat treatment specification: [SCALE STEEL]anneal 780 ~ 880℃ quick cooling;
Metallographic structure: The structure is characterized by ferritic shape.
The Delivery Status of AISI 446/ SUS 446/ UNS S44600 Stainless:
Delivery shall be in the standard state of heat treatment, and the type of heat treatment shall be indicated in the contract; If not specified, [SCALE STEEL]the goods shall be delivered without heat treatment.