〣Product description

304 stainless steel is a common material in stainless steel, the density of 7.93g /cm³; Also known in the industry as 18/8 stainless steel, meaning containing more than 18% chromium and more than 8% nickel; High temperature resistance 800℃, has the characteristics of good processing performance, high toughness, widely used in industrial and furniture decoration industry and food and medical industry.

〣Scope of application

System description: 304 stainless steel is the most widely used chrome-nickel stainless steel, as a widely used steel, has good corrosion resistance, heat resistance, low temperature strength and mechanical properties; Stamping, bending and other hot processing good, no heat treatment hardening phenomenon (using temperature -196℃ ~ 800℃). Corrosion resistance in the atmosphere, if it is an industrial atmosphere or heavily polluted area, it needs to be cleaned in time to avoid corrosion. Suitable for food processing, storage and transportation. It has good workability and weldability. Plate heat exchanger, bellows, household articles (1 and 2 types of tableware, cabinets, indoor pipelines, water heaters, boilers, bathtubs), automobile accessories (windshield wipers, mufflers, molding products), medical equipment, building materials, chemical, food industry, agriculture, Marine parts, etc. The content of 304 stainless steel is strictly controlled, which can also be called food grade 304 stainless steel

Most of the requirements are to maintain the original appearance of the building for a long time. In determining the type of stainless steel to be selected, the main consideration is the required aesthetic standards, the corrosion of the location of the atmosphere and the cleaning system to be used. However, other applications increasingly seek only structural integrity or impermeability. For example, the roofs and side walls of industrial buildings. In these applications, the owner's cost of construction may be more important than aesthetics, even if the surface is not very clean. 304 stainless steel works quite well in dry indoor environments. However, in rural and urban areas, it is necessary to wash frequently if it wants to maintain its appearance outdoors. In heavily polluted industrial areas and coastal areas, the surface can be very dirty and even rust.

But to achieve the aesthetic effect in the outdoor environment, it is necessary to use nickel-containing stainless steel. Therefore, 304 stainless steel is widely used in curtain wall, side wall, roof and other architectural purposes, but in the serious erosion of the industrial or Marine atmosphere, the best use of 316 stainless steel. Stainless steel door, people have fully realized the advantages of using stainless steel in structural applications. 304 and 316 stainless steel are included in several design guidelines. Because "duplex" stainless steel 2205 has combined good atmospheric corrosion resistance with high tensile strength and elastic limit strength, this steel is also included in the European guidelines. In fact, stainless steel is manufactured in all standard metal shapes and sizes, and there are many special shapes. The most commonly used products are made of sheet and strip steel, as well as medium and thick plates for special products, for example, hot rolled structural sections and extruded structural sections. There are also round, oval, square, rectangular and hexagonal welded pipe or seamless steel pipe and other forms of products, including profiles, bars, wires and castings.

〣Product standard

International method of marking stainless steel

The American Iron and Steel Institute uses three digits to label standard grades of malleable stainless steel. Among them:

① Austenitic stainless steels are marked with numbers of 200 and 300 series. For example, some more common austenitic stainless steels are marked with 201, 304, 316 and 310.

② Ferrite and martensitic stainless steel are represented by 400 series numbers.

③ Ferritic stainless steel is 430 and 446 as marks, martensitic stainless steel is 410, 420 and 440C as marks,

(4) duplex (austenitic - ferrite), stainless steel, precipitate-hardened stainless steel and iron content of less than 50% of the high alloy is usually used in the patent or trademark name.

4). Classification and grading of standards

4-1 Classification: ① National standard GB ② industry standard YB ③ Local standard ④ Enterprise standard Q/CB

4-2 classification: ① product standard ② packaging standard ③ method standard ④ basic standard

4-3 Standard level (divided into three levels) : Y level: international advanced level I level: international general level H level: domestic advanced level

4-4 National standard

GB1220-2007 Stainless Steel Bar (Grade I) GB4241-84 Stainless Steel Welding Disk Park (Grade H)

GB4356-2002 Stainless Steel Welding Disk (I Class) GB1270-80 Stainless Steel Pipe (I class)

GB12771-2000 Stainless Steel Welded pipe (Y grade) GB3280-2007 Stainless Steel cold plate (I grade)

GB4237-2007 Stainless Steel Hot Plate (Class I) GB4239-91 Stainless Steel Cold Strip (Class I)

〣Product Introduction

1、ASTM A276（Standard Specification for Stainless Steel Bars and Shapes）

2、ASTM A240（Chromium and Chromium-Nickel Stainless Steel Plate, Sheet, and Strip for Pressure essels and for General Applications）

3、JIS G4305（cold-rolled stainless steel plate, sheet and strip）

4、JIS G4303 （Stainless steel bars）