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304/304L Stainless Steel Castings Manufacturers

Dedicated to the production of stainless steel, carbon steel and low alloy steel materials, precision casting steel parts, the use of advanced silica gel casting process, water glass lost wax casting process and film sand casting process.

Home / Product / Stainless Steel Casting Parts / 304/304L Stainless Steel Castings

304 and 304L stainless steel are the two commonly used types of stainless steel, each with unique advantages and application areas in the casting process. The food industry has extremely high requirements for material safety. As a healthy food contact material, 304 and 304L stainless steel castings have been widely used. As a high-quality material, stainless steel castings are also widely used in the medical device industry, electric power, aerospace, automobile manufacturing, and other fields.
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304 Stainless Steel Castings

304 stainless steel is a general-purpose stainless steel material that is favored for its good corrosion resistance and formability. 304 stainless steel contains high chromium and nickel elements, has good corrosion resistance, and can resist the erosion of various chemical substances. 304 stainless steel has good thermoplasticity and is easy to process such as casting, rolling, and bending, and can produce parts of various complex shapes and sizes. Due to its corrosion resistance and formability, 304 stainless steel is widely used in home appliances, kitchenware, medical equipment, chemical equipment, and other fields.

304L Stainless Steel Castings

304L stainless steel is a low-carbon stainless steel with a lower carbon content than 304 stainless steel. 304L stainless steel has less tendency to suffer from intergranular corrosion and has higher purity and toughness. Due to its low carbon composition, 304L stainless steel has better welding performance and can meet the requirements of various welding processes. Due to its welding performance and purity, 304L stainless steel is widely used in the petroleum, chemical industry, nuclear industry, and other fields.

About Us
Dongtai Weiqiang Machinery Parts Factory
Dongtai Weiqiang Machinery Parts Factory

Dongtai City's strong mechanical parts factory is fammous China 304/304L Stainless Steel Castings manufacturers and Custom 304/304L Stainless Steel Castings factory, a combination of industry and trade enterprises, is committed to the production of stainless steel, carbon steel, and low alloy steel materials, precision cast steel parts, the use of advanced silicone casting process, water glass lost wax casting process, and film sand casting process.


It is a diversified casting of large-scale professional production base, a set of precision casting plants and machining plants in one, based on the high-grade and high-end market, the annual production capacity of precision castings, and various types of castings.

The annual production of precision castings and all kinds of castings of more than 20,000 tonnes, mainly exported to the United States, Germany, Japan, Spain, Italy, the United Kingdom, South Korea, Australia, Canada and dozens of countries, cooperation with many of the customers in the train, automobile, forklift and construction machinery OEM customers, including the world's top 500 companies more than 10, has become an important supplier of precision castings for them in China.

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304/304L Stainless Steel Castings Industry knowledge

What are the main differences between 304 and 304L stainless steel?
The main differences between 304 and 304L Stainless Steel Castings lie in their carbon content and the resulting effects on their properties and applications:
Carbon Content
304 Stainless Steel: Contains up to 0.08% carbon.
304L Stainless Steel: Contains a lower carbon content, typically up to 0.03%.
Intergranular Corrosion
304 Stainless Steel: Higher carbon content can lead to sensitization, a condition where chromium carbides form at grain boundaries, reducing corrosion resistance. This can make 304 susceptible to intergranular corrosion, especially in welded areas.
304L Stainless Steel: Lower carbon content reduces the risk of sensitization and intergranular corrosion, making it more resistant in welded areas.
Welding
304 Stainless Steel: While weldable, it may require post-weld annealing to restore corrosion resistance.
304L Stainless Steel: Superior welding performance due to its lower carbon content, often eliminating the need for post-weld annealing.
Strength
304 Stainless Steel: Slightly higher tensile and yield strength due to the higher carbon content.
304L Stainless Steel: Slightly lower strength compared to 304, but still sufficient for most applications.

 

Are there any special considerations when welding 304/304L Stainless Steel Castings?
1. Avoiding Sensitization
304 Stainless Steel: The higher carbon content in 304 can lead to sensitization, where chromium carbides form at grain boundaries, reducing corrosion resistance. To prevent this, it may be necessary to use low-heat input methods or post-weld annealing to dissolve the carbides.
304L Stainless Steel: The lower carbon content in 304L reduces the risk of sensitization, making it less likely to suffer from intergranular corrosion, especially in welded areas. This often eliminates the need for post-weld annealing.
2. Selection of Filler Material
Use a filler material with a similar or slightly higher alloy content than the base metal. For both 304 and 304L, commonly used fillers include:
308L or 309L for welding 304 stainless steel.
308L for welding 304L stainless steel.
316L for applications requiring higher corrosion resistance.
3. Welding Techniques
Heat Control: Control heat input to minimize distortion and reduce the risk of sensitization. Lower heat inputs are preferred.
Shielding Gas: Use an appropriate shielding gas, such as argon or a mixture of argon and helium, to protect the weld pool from oxidation.
Preheating and Post-Weld Treatment: Typically, preheating is not required. For 304 stainless steel, post-weld annealing may be necessary to restore corrosion resistance if high heat inputs are used.
4. Cleanliness
Ensure the welding area and filler materials are clean and free from contaminants like oil, grease, or dirt. Contaminants can introduce impurities into the weld, leading to defects.
5. Welding Methods
TIG Welding (GTAW): Preferred for its precision and control, producing high-quality welds with minimal heat input.
MIG Welding (GMAW): Suitable for thicker sections, but requires careful control of heat input to avoid distortion.
Stick Welding (SMAW): Can be used for thicker sections, but may introduce more heat, increasing the risk of sensitization in 304 stainless steel.