GB 13014-1991: The Board of Chemical Composition and Brand Numbers of Heat-treated Steel Bars
1. Basic rules
This code sets out the classification, chemical composition and brand numbers of heat-treated steel bars (hereinafter referred to as “bars”).
2. Classification
The heat-treated steel bars are divided into six categories, which are rolled and forged bars, cold drawn bars, medium frequency and semi-continuously quenched steel bars, pre-hardened steel bars, hard-drawn steel bars and twisted steel bars.
3. Chemical composition
(1) Carbon content
The carbon content of heat-treated steel bars should be in the range of 0.10-2.30% (by mass) according to the quality grade of steel bars.
(2) Silicon content
The silicon content of heat-treated steel bars should be in the range of 0.20-2.20% (by mass) according to the quality grade of steel bars.
(3) Sulfur and phosphorus content
The sulfur and phosphorus content of heat-treated steel bars should be lower than 0.045% (by mass) according to the quality grade of steel bars.
(4) Manganese content
The manganese content of heat-treated steel bars should be in the range of 0.50-5.00% (by mass) according to the quality grade of steel bars.
(5) Other elements
The content of other elements such as cobalt, chromium, aluminum, titanium, vanadium and nickel should be lower than 0.50% (by mass) according to the quality grade of steel bars, and the content of rare earth elements should be lower than 0.10% (by mass) according to the quality grade of steel bars.
4. Brand numbers
The brand numbers of heat-treated steel bars are divided into two categories, which are national standards and industrial standards. The brand numbers of national standards are based on YB/T/H and GB/T; the brand numbers of industrial standards are usually named after the manufacturers name or sign.
（1）Classification of national brand numbers
① YB/T/HB: High-strength and ductile steel bar for buildings
② YB/T/HC: Heatproof steel bar for vehicles
③ YB/T/HP: Heatproof steel bar for pressure
④ YB/T/HD: High-strength and ductile steel bar for bridges
⑤ YB/T/HH: High-strength and heat-resistant steel bar for structures
⑥ YB/T/HW: High-strength and wear-resistant steel bar for structures
⑦ YB/T/HV: High-strength and heat-resistant steel bar for undulated vessels
⑧ YB/T/HT: High-strength and heat-resistant steel bar for branch pipes
⑨GB/T/HT: Heat-treated steel mobile foundations
(2) Classification of industrial brand numbers
①JIS: Japanese Industrial Standard
②NSA: Nonstandard Alloy
③BKH: Chinese Manufactured Lever Hoist
④KOBELCO: Kobe Steel, Japan
⑤BSF: British Standard Forging
⑥FCM: French Machine Gauge
⑦TP: Terex Positioner
⑧TOSHIBA: Japan
⑨HITACHI: Japan
⑩Komatsu: Japan
5. Label
The brand numbers and product specifications of the heat-treated steel bars should be marked on the product package. In addition, the paint mark should be clean and distinct, and the surface of the product should be free from dirt, grease, rust and other impurities that affect the appearance of the product.
6. Packaging
The heat-treated steel bars should be properly packed with wooden cases or metal banded cases, and the product surface should not be scratched, corroded and contaminated due to the packaging materials. In addition, the quantity of the products in each package should be appropriate, so as to ensure the safe transportation of the products.
7. Transportation
The heat-treated steel bars should be transported in compliance with the relevant transportation regulations. In addition, the manufacturers should also attach test report, quality certificate and other related documents to the products during transportation.
