What is 309 Stainless Steel Coil?

Types 309 and 309S stainless steel, designated as AISI 309 and AISI 309S, are austenitic chromium-nickel alloys known for their high corrosion resistance, excellent oxidation resistance, and robust strength at both room and elevated temperatures. AISI 309S, identified by its lower carbon content to minimize carbide precipitation, enhances weldability compared to its counterpart, AISI 309. These alloys, often referred to by their material number 1.4828 (particularly for AISI 309), showcase exceptional heat resistance, making them suitable for high-temperature applications. Despite being primarily nonmagnetic in their annealed state, they may exhibit slight magnetism upon cold working. The main distinction between these two variants lies in the carbon content: 309 stainless steel has a higher carbon level, while 309S stainless steel, or SS309S, offers improved weldability due to its reduced carbon composition, ensuring that both meet the needs of various high-temperature environments while maintaining excellent performance.

Feature of 309 Stainless Steel Coil

AISI 309 and 309S stainless steel, known for their austenitic chromium-nickel composition, are distinguished by their excellent features tailored for high-temperature applications. These alloys, often referred to by the material number 1.4828, especially for AISI 309, exhibit remarkable corrosion resistance, heat resistance, and strength across a wide temperature range. Both 309 stainless steel and its variant, AISI 309S (SS309S), share a unique ability to withstand temperatures from 1100 to 1600°F (593 to 871°C), though exposure within this range may lead to sigma phase formation, which can affect the material's ductility and impact resistance at room temperature. To mitigate this, it's advised to avoid subjecting the material to heavy mechanical impacts after exposure to high temperatures.

The machinability of 309 stainless steel coils (SS309) stands at 43% relative to AISI B1112 steel, suggesting that room temperature forming is preferable for optimal results. For welding, it's recommended to use AWS E309-16 covered electrodes or ER309 bare wire, which aligns with the alloy's composition to ensure a strong weld without compromising the steel's integrity. The versatility of 309 and 309S grades, alongside their balanced carbon content capable of meeting both 309S and 309H specifications, make these stainless steel coils a preferred choice for a broad range of high-temperature and corrosion-resistant applications.

Product parameters

Product Name	309/309S Stainless Steel Coil
Type	Steel Coil
Thickness	2.5mm-10.0mm
Length	2000mm, 2440mm, 3000mm, 5800mm, 6000mm, etc.
Width	610mm-2000mm
Standard	ASTM, AISI, JIS, GB, DIN, EN, etc.
Surface	BA, 2B, NO.1, NO.4, 4K, HL, 8K, etc.
Scope of Application	Widely used in high temperature and electrical industry, medical equipment construction, chemical, food industry, agriculture and ship parts, food and beverage packaging, Kitchen supplies, trains, airplanes, conveyor belts, vehicles, bolts, nuts, springs and screens, etc.
Certificate	ISO, SGS, BV, etc.
Production Technology	Hot Rolling, Cold Rolling
Edge Processing	Edging, Trimming

 

Chemical Composition

C	Si	Mn	Cr	Ni	S	P
≤ 0.08	≤ 0.75	≤ 2.0	22.0～24.0	12.0～15.0	≤ 0.03	≤ 0.045

 

Mechanical Properties

Tensile Strength Kb (MPa)	Yield Strength σ0.2 (MPa)	Elongation D5 (%)	Hardness
≥515	≥205	≥35	≤ 217HB

 

Physical Performance

Density(g/cm³)	Modulus of Elasticity(Gpa)	Coefficient of Thermal Expansion(10-6/°C)	Coefficient of Thermal Conductivity(W/m*K)	Resistivity(ΜΩ. cm)
7.98	200	14.9	15.6	78

 

Surface Selection

Why Choose Us

Behind the growth and success of Kuaima Steel is years of hard work and dedication in the steel industry and meeting customers' needs on time. Advanced technology, standard products, certified quality standards and the bestcustomer service make Kuiama Steel a true leader in the global market.

Service field

Every industry has its unique set of material specifications and needs. That’s why you can count on the exceptional experience and industry knowledge of the professionals at Kuaima Steel - Meeting the Exact Needs of Every Industry That Uses steel.

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  Machinery manufacturing industry
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  Power Ceneration
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  Oil & Gas
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  Manufacturing
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  Construction
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  Ship building
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  Automobile manufacturing
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  Pipe Fabrication