S30400 A193 B8 Class 2 ASTM A193/A193M-2019 Stainless Steel wire Material

S30400 A193 B8 Class 2 ASTM A193/A193M-2019 Stainless steel wire is a high-performance austenitic stainless steel material, with excellent mechanical properties and corrosion resistance, suitable for a variety of high temperature, high pressure and special purpose industrial fields.

Material designation	A193 B8 Class 2
UNS	S30400
Other names	304
Correspondence standard	ASTM A193/A193M-2019 Alloy-steel and stainless steel bolting for high temperature or high pressure service and other special purpose applications
Sort out	Austenitic stainless steel
Property	Strength Corrosion resistance Low temperature toughness forging weldability
Tag	Antioxidant plasticity
Instructions	Heat treatment: All austenitic stainless steels should be treated with carbide solution (special requirements for each grade). Class 2 (Class 2) can be applied to rods, wires and finished fasteners. The material should be treated with carbide solution, heated from room temperature and kept at a temperature sufficient to allow chromium carbide to enter the solution for a sufficient time, and then cooled at a rate sufficient to prevent carbide precipitation. After these treatments, the material is then strain hardened to achieve the desired properties.
	Material description: 304 is a typical low-carbon austenitic stainless steel, the grade is on the basis of 302 to further reduce the carbon content of the obtained, with good processing and molding properties and oxidation resistance, oxidation acid (such as nitric acid) has a strong corrosion resistance, alkali solution and most organic acids and inorganic acids also have a certain corrosion resistance. Intergranular corrosion resistance is better than 302 with higher carbon content, but it still has a tendency of intergranular corrosion when working in water and steam for a long time. The steel has good weldability. Austenitic stainless steel cannot be strengthened by heat treatment and can only be strengthened by work hardening.
	Chemical properties: 304 has stable oxidation resistance in hot air below 900°C, and good corrosion resistance to nitric acid, sulfuric acid, acetic acid, oxalic acid and phosphoric acid. Intergranular corrosion damage may occur when parts work in corrosive medium, water or steam medium for a long time. In the state of solid solution, the arch constant variable sample is in 42% magnesium chloride boiling solution. Intergranular corrosion failure occurred at 31h.
	Scope of application of this standard
	① This standard includes alloy steel and stainless steel bolting materials and bolting fittings for pressure vessels, valves, flanges and fittings for high temperature or high pressure equipment or for other special purposes. Bolted connections are defined in ASTM A962/A962M. The bar and wire shall be hot-rolled, and the material may be further processed by centerless grinding or cold drawing. Austenitic stainless steel can be strain hardened by carbide solution treatment or carbide solution treatment. When ordering strain-hardened austenitic steels, the buyer should take special care to ensure that the contents of Appendix X1 are fully understood.
	② This standard includes several grades of ferritic steel and austenitic stainless steel labeled B5, B8, etc. The choice of steel is determined by design, service conditions, mechanical properties and high temperature properties.

A193 B8 Class 2 Chemical Element Content (%)

Ingredient	C	Si	Mn	P	S	Cr	Ni
Minimum value	-	-	-	-	-	18	8
Maximum value	0.08	1	2	0.045	0.03	20	11

Due to its excellent corrosion resistance and ability to maintain strength at high temperatures, S30400 A193 B8 Class 2 ASTM A193/A193M-2019 Stainless Steel wire is widely used in petrochemical, Marine engineering, high-temperature equipment and other industrial fields requiring high strength and corrosion resistance.

A193 B8 Class 2 Mechanical properties

Diameter d mm	Heat treatment or condition	Tensile strength σb Mpa	Yield point σs Mpa	Elongation or elongation after breaking δ %	Shrinkage of section ψ %	Hardness HBW
d≤M20	Carbide solution treatment with strain hardening	≥860	≥690	≥12	≥35	≤321
M20＜d≤M24	Carbide solution treatment with strain hardening	≥795	≥550	≥15	≥35	≤321
M24＜d≤M30	Carbide solution treatment with strain hardening	≥725	≥450	≥20	≥35	≤321
M30＜d≤M36	Carbide solution treatment with strain hardening	≥690	≥345	≥28	≥45	≤321

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