GB/T 38347-2019Hot-rolled wire rod of ultra-low carbon steel with high boron (English PDF)

1 Scope

This Standard stipulates the designation representation method, order content, dimensions, appearances, weights, allowable deviations, technical requirements, test methods, inspection rules, packaging, marking and quality certificate of hot-rolled wire rod of ultra-low carbon steel with high boron.

This Standard is applicable to hot-rolled wire rod of ultra-low carbon steel with high boron with the diameter of 3 mm ~ 60 mm (hereinafter referred to as wire rod).

2 Normative References

The following documents are indispensable to the application of this document. In terms of references with a specified date, only versions with a specified date are applicable to this document. In terms of references without a specified date, the latest version (including all the modifications) is applicable to this document.

GB/T 222 Permissible Tolerances for Chemical Composition of Steel Products

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 223.9 Iron Steel and Alloy - Determination of Aluminum Content - Chrome Azurol S Photometric Method

GB/T 223.11 Iron, Steel and Alloy - Determination of Chromium Content - Visual Titration or Potentiometric Titration Method

GB/T 223.37 Methods for Chemical Analysis of Iron, Steel and Alloy - The Indophenol Blue Photometric Method for the Determination of Nitrogen Content after Distillation Separation

GB/T 223.59 Iron, Steel and Alloy - Determination of Phosphorus Content - Bismuth Phosphomolybdate Blue Spectrophotometric Method and Antimony Phosphomolybdate Blue Spectrophotometric Method

GB/T 223.63 Methods for Chemical Analysis of Iron, Steel and Alloy - The Sodium (potassium) Periodate Photometric Method for the Determination of Manganese Conductimetric Method after Fusion in a Current of Inert Gas

GB/T 20125 Low-alloy Steel - Determination of Multi-element Contents - Inductively Coupled Plasma Atomic Emission Spectrometric Method

GB/T 20126 Unalloyed Steel - Determination of Low Carbon Content - Part 2: Infrared Absorption Method after Combustion in an Induction Furnace (with preheating)

GB/T 22368 Low-alloy Steel - Determination of Multi-element Contents - Glow Discharge Optical Emission Spectrometry (routine method)

YB/T 081 Rule for Rounding Off of Numerical Values and Judgement of Testing Values for Technical Standards of Metallurgy

3 Designation Representation Method

The designations of wire rod are: CH1B, CH3B, CH5B, BP05, BP05D. See the specific meaning below:

CH1B:

---C represents "carbon";

---H represents the initials of "high";

---B represents "boron";

---1 represents one in ten thousand of carbon content.

BP05D:

---BP represents the initials of "blasting";

---05 represents five in ten thousand of carbon content;

---D represents the initials of "electric".

Please refer to Appendix A for the purposes of each designation of steel.

4 Order Content

Order content, which shall be explicitly indicated in the contract, includes:

a) Serial No. of this Standard;

b) Product name; […]