This standard specifies classification, symbols, ordering, dimensions, shape, weight, tolerances, specifications, test methods, inspection rules, packaging, marking and quality certificate of unalloyed steels for cold heading and cold extruding.
This standard is applicable to hot-rolled wire rods with nominal diameter from 5.0 mm to 60 mm and hot-rolled round steel bars with nominal diameter from 12 mm to 100 mm (hereinafter referred to as "steels").
2 Normative References
The following documents are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
GB/T 222 Permissible tolerances for chemical composition of steel products
GB/T 223.3 Methods for chemical analysis of iron, steel and alloy — The diantipyrylmethane phosphomolybdate gravimetric method for the determination of phosphorus content
GB/T 223.4 Alloyed steel — Determination of manganese content — Potentiometric or visual titration method
GB/T 223.5 Steel and iron — Determination of acid-soluble silicon and total silicon content — Reduced molybdosilicate spectrophotometric method (GB/T 223.5-2008, ISO 4829-1:1996, ISO 4829-2:1998, MOD)
GB/T 223.8 Methods for chemical analysis of iron, steel and alloy — The sodium fluoride separation-EDTA titration method for the determination of aluminium content
GB/T 223.9 Iron steel and alloy — Determination of aluminium 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 223.11-2008, ISO 4937:1986, MOD)
GB/T 223.12 Methods for chemical analysis of iron, steel and alloy — The sodium carbonate separation-diphenyl carbazide photometric method for the determination of chromium content
