There are various classification methods for steel, and the main methods are as follows:<\/p>\n\n\n\n
1. Classification by quality<\/p>\n\n\n\n
(1) Ordinary steel (P \u2264 0.045%, s \u2264 0.050%)<\/p>\n\n\n\n
(2) High quality steel (P and s \u2264 0.035%)<\/p>\n\n\n\n
(3) High quality steel (P \u2264 0.035%, s \u2264 0.030%)<\/p>\n\n\n\n
2. Classification by chemical composition<\/p>\n\n\n\n
(1) Carbon steel: A. low carbon steel (C \u2264 0.25%); b. Medium carbon steel (C \u2264 0.25 ~ 0.60%); c. High carbon steel (C \u2264 0.60%).<\/p>\n\n\n\n
(2) Alloy steel: A. low alloy steel (total content of alloy elements \u2264 5%); b. Medium alloy steel (total alloy element content > 5 ~ 10%); c. High alloy steel (total alloy element content > 10%)<\/p>\n\n\n\n
3. Classification by forming method:<\/p>\n\n\n\n
(1) Forged steel;<\/p>\n\n\n\n
(2) Cast steel;<\/p>\n\n\n\n
(3) Hot rolled steel;<\/p>\n\n\n\n
(4) Cold drawn steel.<\/p>\n\n\n\n
4. Classification by metallographic structure<\/p>\n\n\n\n
(1) Annealed: A. hypoeutectoid steel (ferrite + pearlite); b. Eutectoid steel (pearlite); c. Hypereutectoid steel (pearlite + cementite); d. Ledeburite steel (pearlite + cementite);<\/p>\n\n\n\n
(2) Normalized: A. pearlite steel; b. Bainitic steel; c. Martensitic steel; d. Austenitic steel;<\/p>\n\n\n\n
(3) No phase transition or partial phase transition.<\/p>\n\n\n\n
5. Classification by purpose<\/p>\n\n\n\n
(1) Steel for construction and Engineering: A. ordinary carbon structural steel; b. Low alloy structural steel; c. Steel reinforcement.<\/p>\n\n\n\n
(2) Structural steel:<\/p>\n\n\n\n
a. Steel for mechanical manufacturing: (a) quenched and tempered structural steel; (b) Surface hardened structural steel: including carburized steel, ammoniated steel and steel for surface quenching; (c) Easy to cut structural steel; (d) Steel for cold plastic forming: including steel for cold stamping and steel for cold heading<\/p>\n\n\n\n
b. Spring steel<\/p>\n\n\n\n
c. Bearing steel<\/p>\n\n\n\n
(3) Tool steel: A. carbon tool steel; b. Alloy tool steel; c. High speed steel tools.<\/p>\n\n\n\n
(4) Special performance steel: A. stainless and acid resistant steel; b. Heat resistant steel: including oxidation resistant steel, heat strength steel and air valve steel; c. Electric heating alloy steel; d. Wear resistant steel; e. Low temperature steel; f. Electrical steel.<\/p>\n\n\n\n
(5) Professional steel – such as bridge steel, ship steel, boiler steel, pressure vessel steel, agricultural machinery steel, etc.<\/p>\n\n\n\n
6. Comprehensive classification<\/p>\n\n\n\n
(1) Ordinary steel<\/p>\n\n\n\n
a. Carbon structural steel: (a) Q195; (b) Q215(A\u3001B); (c)Q235(A\u3001B\u3001C); (d) Q255(A\u3001B); (e)Q275\u3002<\/p>\n\n\n\n
b. Low alloy structural steel<\/p>\n\n\n\n
c. General structural steel for specific purposes<\/p>\n\n\n\n
(2) High quality steel (including high-quality steel)<\/p>\n\n\n\n
a. Structural steel: (a) high quality carbon structural steel; (b) Alloy structural steel; (c) Spring steel; (d) Easy to cut steel; (e) Bearing steel; (f) Special purpose high-quality structural steel.<\/p>\n\n\n\n
b. Tool steel: (a) carbon tool steel; (b) Alloy tool steel; (c) High speed tool steel.<\/p>\n\n\n\n
c. Special performance steel: (a) stainless and acid resistant steel; (b) Heat resistant steel; (c) Electric heating alloy steel; (d) Electrical steel; (e) High manganese wear resistant steel.<\/p>\n\n\n\n
7. Classification by smelting method<\/p>\n\n\n\n
(1) By furnace type<\/p>\n\n\n\n
a. Converter steel: (a) acid converter steel; (b) Basic converter steel. Or (a) bottom blown converter steel; (b) Side blown converter steel; (c) Top blown converter steel.<\/p>\n\n\n\n
b. Electric furnace steel: (a) electric arc furnace steel; (b) Electroslag furnace steel; (c) Induction furnace steel; (d) Vacuum consumable furnace steel; (e) Electron beam furnace steel.<\/p>\n\n\n\n
(2) According to deoxidation degree and pouring system<\/p>\n\n\n\n
a. Boiling steel;<\/p>\n\n\n\n
b. Semi killed steel;<\/p>\n\n\n\n
c. Killed steel;<\/p>\n\n\n\n
d. Special killed steel<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"
There are various classification methods for steel, and the main methods are as follows: 1. Classification by quality (1) Ordinary steel (P \u2264 0.045%, s \u2264 0.050%) (2) High quality steel (P and s \u2264 0.035%) (3) High quality steel (P \u2264 0.035%, s \u2264 0.030%) 2. Classification by chemical composition (1) Carbon steel: A. […]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":2,"featured_media":494,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":false,"jetpack_social_options":{"image_generator_settings":{"template":"highway","enabled":false},"version":2}},"categories":[7],"tags":[],"class_list":["post-309","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-custom-manufacturing-b2b-technology-knowledge"],"jetpack_publicize_connections":[],"yoast_head":"\n