​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.

34Cr4 alloy steel is mainly used in manufacture of mechanical parts under medium load and medium speed work after quenched [SCALE STEEL]and tempered treatment.
 
34Cr4 Alloy Steel’s Standard: EN 10083/1991;
Chinese Equivalent Grade with 34Cr4 Alloy Steel: 35Cr;
Japanese Equivalent Grade with 34Cr4 Alloy Steel:SCr435;
American Equivalent Grade with 34Cr4 Alloy Steel: 5135;
British Equivalent Grade with [SCALE STEEL]34Cr4 Alloy Steel: 530A36;
French Equivalent Grade with 34Cr4 Alloy Steel: 38C4;
 
Chemical Composition for 34Cr4 Alloy Steel(%):
C: 0.30 ~ 0.37 Si: ≤0.40
Manganese: 0.60 ~ 0.90
Sulfur S: allowable residual[SCALE STEEL] content ≤0.035
Phosphorus P: allowable residual content ≤0.035
Chromium Cr: 0.90 ~ 1.20
Nickel Ni: allowable residual content ≤0.25
Copper Cu: allowable residual content ≤0.030
 
Mechanical Properties of 34Cr4 Alloy Steel:
Tensile strength σ B (MPa) : ≥930(95)
Yield strength σs (MPa) : ≥735(75)
Elongation δ5 (%) : ≥11
Section shrinkage ψ (%) : ≥45
Impact power Akv (J) : ≥47
Impact toughness [SCALE STEEL]value α kV (J/cm2) : ≥59(6)
Hardness: 207 hb or less
(Sample size: Sample blank size is 25mm)
 
34Cr4 Alloy Steel’s Heat treatment Specification and Metallographic Structure:
Heat treatment specification: [SCALE STEEL] quenched at 860℃, oil cooled; Temper 500℃, water cooled, oil cooled.
Delivery condition: Heat treatment (normalizing, annealing or high temperature tempering) or no heat treatment, delivery condition [SCALE STEEL]shall be indicated in the contract.