S30400 A193 B8A Class 1A ASTM A193/A193M-2019 Stainless Steel supplier

This stainless steel wire is widely used in petrochemical, Marine engineering, high-temperature equipment and other industrial fields requiring high strength and corrosion resistance. For example, it can be used to make fasteners, valves, flanges, pressure vessels and other equipment connection parts, can also be used to make bellows, household items (such as tableware, cabinets, etc.), automotive accessories (such as windshield wipers, mufflers, etc.) and medical equipment.

Material designation	A193 B8A Class 1A
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 1A (Class 1A all grades) can be used for finished fasteners. Grade 1A steel - After all hot rolling, forging, upsetting and threading is completed, the finished fasteners should be treated with carbide solution. This rule does not apply to raw materials such as rods. Fasteners should be heated at 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.
	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.
	②ThisstandardincludesseveralgradesofferriticsteelandausteniticstainlesssteellabeledB5,B8,etc.Thechoiceofsteelisdeterminedbydesign,serviceconditions,mechanicalpropertiesandhightemperatureproperties.

A193 B8A Class 1A 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

A193 B8A Class 1A Mechanical properties

Heat treatment or condition	Tensile strength σb Mpa	Yield point σs Mpa	Elongation or elongation after breaking δ %	Shrinkage of section ψ %	Hardness HBW
Solid solution treatment of carbide in finished state	≥515	≥205	≥30	≥50	≤192

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