This standard specifies the classification and code, order contents, dimension, shape, technical requirements, test methods, inspection rules, and packaging, marking and certification of high-carbon chromium bearing steel.
This standard is applicable to the hot-rolled steel, forged round steel, round wire rod and cold-drawn round steel (rod or disc) (hereafter referred to as "steels") which are of high-carbon chromium bearing steel and used for manufacturing bearing ring and rolling element.
As agreed by the supplier and the purchaser, steels and steel billets of other varieties and specifications may also be supplied, and the specific requirements shall be noted in the contract.
2 Normative References
The following documents for the application of this document are essential. Any dated reference, just dated edition applies to this document. For undated references, the latest edition (including any amendments) applies to this document.
GB/T 223.5 Steel and Iron - Determination of Acid-soluble Silicon and Total Silicon Content - Reduced Molybdosilicate Spectrophotometric Method
GB/T 223.9 Iron Steel and Alloy - Determination of Aluminum Content - Chrom Azurol S Photometric Method
GB/T 223.11 Iron Steel and Alloy - Determination of Chromium Content - Visual Titration or Potentiometric Titration Method
GB/T 223.23 Iron, Steel and Alloy - Determination of Nickel Content - The Dimethylglyoxime Spectrophotometric Method
GB/T 223.26 Iron Steel and Alloy-Determination of Molybdenum Content-The Thiocyanate Spectrophotometric Method
GB/T 223.29 Iron Steel and Alloy - Determination of Lead Content - Carrier Precipitation - Xylenol Orange Spectrophotometric Method
GB/T 223.31 Iron Steel and Alloy - Determination of Arsenic Content - Distillation - Molybdenum Blue Spectrophotometric Method
GB/T 223.47 Methods for Chemical Analysis of Iron, Steel and Alloy - The Carrier Precipitation - Molybdenum Blue Photometric Method for the Determination of Antimony Content
GB/T 223.50 Methods for Chemical Analysis of Iron, Steel and Alloy - The Phenylfuorone - CTMAB Direct Photometric Method for the Determination of Tin Content
GB/T 223.53 Methods for Chemical Analysis of Iron, Steel and Alloy - The Flame Atomic Absorption Spectrophotometric Method for the Determination of Copper Content
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3 Classification and Code
3.1 According to metallurgical quality, steel is classified into:
a) Quality steel;
b) High-grade fine steel (letter "A" is added after the designation);
c) Special-grade fine steel (letter "E" is added after the designation).
3.2 According to casting technology, steel is classified into:
a) Moulded steel;
b) Continuously cast steel.
3.3 According to applied work method, steel is classified into:
a) Steel for pressure work (UP);
b) Steel for cut work (UC).
GB/T 18254-2016 The following standards are cited：
