304 stainless steel 
 Chemical grade 304 stainless steel the old 06Cr19Ni10 grades (0Cr18Ni9) 19% chromium, and nickel-containing 8-10%. 
 304 stainless steel is the most widely used stainless steel, heat resistant steel. For food production equipment, common chemical equipment, nuclear energy. 
 304 stainless steel pipe 
 The chemical composition of the 304 stainless steel 
 C Si Mn PS Cr Ni (nickel) Mo 
 The SUS304 chemical composition of ≤ 0.08 ≤ 1.00 ≤ 2.00 ≤ 0.05 ≤ 0.03 18.00-20.00 8.00 ~ 10.50 - 

 Density 
 Stainless steel SUS304 a density of 7.93 g/cm3 

 Product standards 
 For 304 stainless steel is a very important parameter directly determines its corrosion resistance, and also determine its value. 
 The 304 most important element is Ni, Cr, but it is not limited to these two elements. The specific requirements of product standard requirements. The industry common judgment situation think that as long as the Ni content of more than 8% Cr content greater than 18%, that is 304 stainless steel. This is why the industry will kind of stainless steel called 18/8 stainless steel. 
 In fact, the product standard 304 has very clear provisions of these product standards for different shapes of stainless steel, there are some differences. Here are some common product standards and testing. 



 304 stainless - 304 stainless steel decision 


 To determine if a material is not 304 stainless steel, and must meet the requirements of Standard product of each element, as long as one is not found, can not be called a 304 stainless steel. 
 1, ASTM A276 (Standard Specification for Stainless Steel Bars Bars and Shapes profile) 

 304 C Mn PS Si Cr Ni 
 Requirements,% 0.08 2.00 0.045 0.030 1.00 18.0-20.0 8.0-11.0 
 2, ASTM A240 (Chromium and Chromium-Nickel Stainless Steel Plate Plate, Sheet sheet, and Strip Strip for Pressure essels and for General Applications) 

 304 C Mn PS Si Cr Ni N 
 Requirements,% 0.07 2.00 0.045 0.030 0.075 17.5-19.5 8.0-10.5 0.10 
 3, JIS G4305 (cold-rolled sheet of cold-rolled stainless steel plate, sheet sheet and strip strip) 

 SUS 304 C Mn PS Si Cr Ni 
 Requirements,% 0.08 2.00 0.045 0.030 1.00 18.0-20.0 8.0-10.5 
 4, JIS G4303 (Stainless steel bars stainless steel rod) 

 SUS 304 C Mn PS Si Cr Ni 
 Requirements,% 0.08 2.00 0.045 0.030 1.00 18.0-20.0 8.0-10.5 




 304 stainless - 304 stainless steel to enlarge Standard 
 International Stainless Steel labeling method 
 American Iron and Steel Institute is a three-digit number to label a variety of standard grade wrought stainless steel. Where: 
 ① austenitic stainless steel 200 and 300 series of digital label, 
 The ② ferritic and martensitic stainless steel 400 series digital. For example, some of the more common austenitic stainless steel 
 Based on 201, 304, 316, and 310 as a marker, 
 ③ ferritic stainless steel in the 430 and 446 mark in 410, 420 and 440C martensitic stainless steel as standard 
 Hutchison, two-phase (austenite - ferrite body), 
 The ④ stainless steel, precipitation hardened stainless steel, and iron content of less than 50% of the high-alloy usually named using the the patented name or trademark. 
 4). Sorting and grading of the standard 
 4-1 hierarchical classification: 
 ① local standards of the national standard GB ② industry standard YB ③ ④ enterprise standard Q / CB 
 4-2: 
 ① packaging standards of product standards ② ③ method standard ④ basic standards 
 4-3 standard level (three levels): 
 Y class: the international advanced level Class I: International general level of Class H: domestic advanced level 
 4-4 GB 
 GB1220-2007 stainless steel bar (I grade) GB4241-84 stainless steel welded plate Park (H) 
 GB4356-2002 stainless steel welded plate Park (I) GB1270-80 stainless steel pipe (I class) 
 Stainless steel welded pipe (Y class) GB12771-2000 GB3280-2007 stainless steel cold plate (I class) 
 Stainless steel hot plate (I grade) GB4237-2007 GB4239-91 stainless steel cooling belt (I Grade)