The stainless steel tube can be classified into a Cr system (400 series), a Cr-Ni system (300 series), a Cr-Mn-Ni (200 series), 

and a precipitation hardening system (600 series). 200 series - chrome-nickel-manganese austenitic stainless steel,

300 series - chrome-nickel austenitic stainless steel.
301 -----extension is good for molding products. It can also be hardened by mechanical processing. Good weldability.

Wear resistance and fatigue strength are better than 304 stainless steel.
302 -----corrosion resistance is the same as 304, because the carbon content is relatively high and the strength is better.
303- ----It is easier to cut than 304 by adding a small amount of sulfur and phosphorus.
304 -----that is 18/8 stainless steel. The GB grade is 0Cr18Ni9. 309 - Better temperature resistance than 304.
316 -----After 304, the second most widely used steel grade, mainly used in the food industry, the pharmaceutical industry

and surgical equipment,

added molybdenum to obtain a special structure resistant to corrosion.
321  - Other properties are similar to 304 except that the addition of titanium reduces the risk of corrosion of the material weld.
400  series - ferritic and martensitic stainless steel.
408 -Good heat resistance, weak corrosion resistance, 11% Cr, 8% Ni.
409 -The cheapest model, usually used as a car exhaust pipe, is a ferritic stainless steel (chrome steel).
410 -Martensite (high-strength chrome steel) with good wear resistance and poor corrosion resistance.
416 -The addition of sulfur improves the processing properties of the material.
420 -"cutting grade" martensitic steel, similar to the earliest stainless steel of Brinell high chromium steel.

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Company information                                                                                          
Shandong Hongtai Metal Co., Ltd. is located in Jinan, Shandong Province, with a registered capital of 31.68 million yuan.
It is a specialized steel sales company integrating  domestic trade and foreign trade.The company's products include
stainless steel, seamless pipe, color coated plate, galvanized sheet, aluminized sheet, aluminum sheet, copper sheet
and other profiles, building materials, pipe series. Products are widely used in chemical, pharmaceutical, electric power,
railway, automotive, paper and construction engineering. The company has long-term close trade relations  with Shandong
Iron and Steel, Tangshan Iron and Steel, Handan Iron and Steel, Jinxi Iron and Steel and other well-known domestic
steel companies