The general materials of stainless steel valves are CF8 (304), CF3 (304L), CF8M (316), CF3M (316L), 321, 1CR18NI9TI, 0CR18NI9, 310S, 2250 and 201 and other ordinary non-standard stainless steel materials. CF8, CF3, CF8M, CF3M and other letter material casting codes, 304, 316 and other numbers are marked as forging codes. And CF8 (304) is the general American standard code, and the corresponding domestic code is 0CR18NI9. And 321 corresponds to the domestic one is 1CR18NI9TI. 304 generally has C≤0.08, Mn≤2.00, P≤0.045, S≤0.030, Si≤1.00, Cr18.0-20.0, Ni:8.0-11.0.316. The structural elements of the material are: C: 0.03～0.08, Si: ≤1.0, Mn: ≤2.0, Cr: 16.18.0, S: ≤0.03, P: ≤0.045, Mo≤2.0-3.0, corresponding to the national standard number 0Cr17Ni12Mo2. The chemical elements of 321 stainless steel are as follows: carbon C: ≤0.08; silicon Si: ≤1.00, manganese Mn: ≤2.00, sulfur S: ≤0.030, phosphorus P: ≤0.035, chromium Cr: 17.00-19.00, nickel Ni: 9.00 ～12.00, Titanium Ti: ≥5×C%. And 316L is an addition of nickel-containing components on the basis of 316, which has higher corrosion resistance. The corresponding grade of 310S is 2520 (0CR25NI20)). We often call it duplex steel, which is a high-quality stainless steel material with high temperature resistance and corrosion resistance, and the price is very expensive. Chemical composition: C: ≤0.08, Si: ≤1.00, Mn: ≤2.00, P: ≤0.035, S: ≤0.030, Ni: ≤19.00-22.00, Cr: ≤24.00-26.00. Stainless steel valves and stainless steel materials have a wide range of uses. They are generally used in chemical plants, food plants, water plants, etc. They have good corrosion resistance, pressure resistance, high temperature resistance, abrasion resistance, and cleanliness. They are indispensable for industrial and civil use One of the valves and materials.
The general materials of carbon steel include carbon steel WCB cast steel, A105 forged steel, 20# steel, LCB low temperature steel, etc. Generally, WCB carbon steel is the most commonly used. WCB cast steel valves play a great role in daily life or industrial pipelines, and they are widely used. The A105 material is a forged steel process, which has good tensile properties, high material density, high pressure resistance, high temperature resistance, and is suitable for use on small pipes. 20# steel is generally used as accessories, generally rod materials, generally bolts, nuts, etc. LCB is low temperature carbon steel, used in low temperature conditions, such as cold storage pipes and so on. The chemical composition of WCB material is: C≤0.3 Mn≤1.0 Si≤0.6 P≤0.05 S≤0.06 Ni:0.5 Cr:0.4 Mo:0.25; A105 forged steel material and casting material will have certain differences: C:≤0.35 Si: ≤0.35 Mn: 0.6-1.05 S: ≤0.050 P: ≤0.040; LCB low temperature carbon steel has ≤0.30 ≤0.60 ≤1.0 steel LC3(-101℃)≤0.15 3.0～4.0.
Performance and characteristics of stainless steel valves and carbon steel valves:
Stainless steel valves are very useful whether they are used in corrosive pipelines and steam pipelines. They all have the characteristics of corrosion resistance, high temperature resistance and high pressure resistance. They are generally used for corrosive pipelines in chemical plants, and pipelines in tap water or food plants. Carbon steel valves have no corrosion resistance and can only be used in non-corrosive medium pipelines such as steam, oil, water, etc. The cost of carbon steel valves is much lower than that of stainless steel, so generally pipelines without corrosive steam are used. Carbon steel is used, but stainless steel valves and other materials are used for corrosiveness.
