409L Stainless Steel Coil

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409L Stainless Steel Coil

The 409L stainless steel has strong resistance to corrosion, high temperature and fatigue, and can realize the life and lightweight of exhaust system components.
409L Stainless steel coil Price in China ,Manufacturer of 409L Stainless Steel coil
With its excellent corrosion resistance, 409L stainless steel is suitable for prolonging the life of automobiles and lightening the weight of automobiles. As an environmentally friendly material for recycling, GM, Ford, Volkswagen, DaimlerChrysler and other major automobile manufacturers adopt 100% stainless steel in their exhaust systems.
Automobile exhaust system will be produced by the automobile engine high temperature, high speed combustion exhaust gas processing, it discharged outside the car.
The main function of the exhaust system is to reduce vibration and noise, and to convert the exhaust gas into a clean gas after it is reburned.
The automobile exhaust system is the longest part of the automobile parts, the system to withstand great temperature changes (-20 ~ 850℃) and high temperature, high speed exhaust gas of high frequency vibration, and in the car the largest change, the most complex environment, 409L can withstand the temperature limit of (-20 ~ 650℃).
Recently, due to environmental protection on the automobile exhaust standards increasingly strict, short distance urban driving increase, winter snow removal agent spread and other reasons, the use of exhaust system standards are increasingly strict, from the European Ⅱ- European standard, the traditional steel can not meet its technical requirements, high-end motorcycle exhaust system has been used 409L material.
The amount of 409L stainless steel used for each vehicle is 35KGS-65KGS.

409L high temperature resistance, can achieve high efficiency of the engine and exhaust system, and reduce the thickness of the exhaust system, can reduce exhaust emissions.
409L low cost, good flexibility, high rate of finished material, easy to replace, belongs to the environmental protection of new products.

Equivalent Material of 409L Stainless Steel Coil

Grade Euronorm Japanese JIS ISO
409L 1.4512 SUH409L X2CrTi12

Standard Specification of 409L Stainless Steel Coil

Thickness 0.3mm-12.0mm
Width 600mm, 700mm, 800mm, 900mm, 1000mm, 1200mm, 1220mm, 1500mm, etc
Length Per Coil
Surface 2B, 2D, BA, NO.1, NO.4, NO.8, 8K, mirror, checkered, embossed, hair line, sand blast, Brush, etching, etc
Finish Cold rolled coil (CR), 2B, 2D, BA NO(8), SATIN (Met with Plastic Coated)
Form Coils, Foils, Rolls, Plain Sheet, Shim Sheet, Perforated Sheet, Chequered Plate, Strip, Flats,
Blank (Circle), Ring (Flange) etc.

409L Stainless Steel Coil Composition Content

Grade C Mn Si P S Cr Ti Ni N
409L Min.
0.75 – 0.50 ≤1.00 ≤1.00 ≤0.04 ≤0.03 11 1 10.5~11.7

(1) When 409L steel crystallizes, the solid-liquid two-phase zone is very small, less than 30℃;
(2) There is almost no γ phase at high temperature.
Therefore, when 409L steel begins to crystallize after casting, the liquid phase has a large degree of undercooling due to direct contact with the surface of the crystallizer. At the same time, the surface of the crystallizer promotes non-spontaneous nucleation. Therefore, the nucleation rate of the liquid phase is high, forming fine equiaxed grains on the surface.
The formation rate of fine equiaxed grains on the surface is very fast, and the titanium carbide is too short to precipitate at this time.
After the formation of fine equiaxed grains, columnar grains are formed in ordinary steels, but there is no columnar grains in 409L steel.
The columnar grains of 409L steel are not easy to grow forward because of the narrow temperature range of liquid-solid two-phase region and the small subcooling zone during crystallization.
At the same time, after the formation of fine equiaxed crystal region, after a period of time, titanium and carbon have time to diffuse and form titanium carbide particles, promoting non-spontaneous nucleation.
The above two reasons make equiaxed grains appear in this region instead of columnar grains.
There is no columnar crystal structure on the cross section, but equiaxed crystal with different sizes.
During the casting process, when the billet temperature drops to 1100℃, if the carbon content is high, part of Cr and C will form carbides, resulting in a chromium poor zone around the carbides, and a small amount of δ phase may appear.
At this time, there are two phases with different properties in the steel, or the content of δ phase is between 32% and 60%, which is the plastic zone of the blank.
The carbon content of 409L steel is very low, even if δ phase is present, the amount is very small.
Therefore, there is no significant impact on performance.

409L steel from high temperature to low temperature almost no α→γ phase transformation, so the grain is easy to grow up, there are thick ferrite structure, low strength, in continuous casting, after the slab is cut up, prone to bend phenomenon, affect the normal production.
The main problem during crystallization of 409L steel is the degradation of properties caused by coarse grain size≥192HB

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