GB/T 9971-2017Pure iron raw material (English PDF)

Foreword

This standard was drafted in accordance with the rules given in GB/T 1.1-2009.

This standard replaces GB/T 9971-2004 "raw iron." This standard compared with GB/T 9971-2004, the main technical changes are as follows.

--- Remove the initial billet varieties and related requirements, the original standard of flat bar and flat steel bar;

--- New product brand YT4. Adjust YT1, YT2, YT3 chemical composition of manganese, sulfur, copper and the upper limit of control element YT1 aluminum Control cap, an increase of various grades of oxygen, titanium content requirements;

--- Increase product smelting method requirements;

--- Canceled the original standard appendix A and Appendix B, carbon and sulfur detection methods directly referenced to the relevant national standards;

--- Refined the surface quality requirements.

1 Scope

This standard specifies the symbols and varieties of raw materials, classification, size, shape and weight, technical requirements, test methods, inspection rules, packages Equipment, signs and quality certificates.

This standard applies to electric alloys, precision alloys (including soft magnetic materials, hard magnetic materials, flexible alloys, expanded alloys, etc.), low carbon stainless steel, Ultra-low carbon stainless steel and powder metallurgy and other raw materials for the use of pure iron billets, hot-rolled steel rods and hot-rolled rod.

2 Normative references

The following documents for the application of this document is essential. For dated references, only the dated version applies to this document. For undated references, the latest edition (including all amendments) applies to this document.

GB/T 223.5 Steel - Determination of acid-soluble silicon and total silicon - Reduced molybdosilicate spectrophotometry

GB/T 223.9 steel and alloy aluminum content - Determination of chromazurol S spectrophotometry

GB/T 223.12 Methods for chemical analysis of iron, steel and alloy - The sodium carbonate separation - diphenylcarbazide photometric method for the determination of chromium content

GB/T 223.19 Methods for chemical analysis of iron, steel and alloy The neocuproine-chloroform extraction spectrophotometric method for the determination of copper content

GB/T 223.23 steel and alloy nickel content - dimethylglyoxime spectrophotometric method

Steel and alloy - Determination of molybdenum content - Thiocyanate spectrophotometric method

GB/T 223.29 steel and alloy - Determination of lead content carrier precipitation - xylenol orange spectrophotometry

Steel and alloy - Determination of arsenic content - Distillation separation - Molybdenum blue spectrophotometric method

GB/T 223.37 Methods for chemical analysis of iron, steel and alloy - The distillation separation - indophenol blue photometric method for the determination of nitrogen content

GB/T 223.47 Methods for chemical analysis of iron, steel and alloy - The molybdenum blue photometric method for the determination of the amount of antimony

GB/T 223.48 Methods for chemical analysis of iron, steel and alloy - The photometric method for the determination of bismuth content

GB/T 223.50 Methods for chemical analysis of iron, steel and alloy The determination of phenylfluorone-cetyltrimethylammonium bromide by spectrophotometry Tin content

GB/T 223.51 Methods for chemical analysis of iron, steel and alloy The 5-Br-PADAP photometric method for the determination of zinc 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

GB/T 223.54 Methods for chemical analysis of iron, steel and alloy - The flame atomic absorption spectrophotometric method for the determination of nickel content

GB/T 223.59 steel and alloy - Determination of phosphorus content bismuth phosphomolybdate blue spectrophotometry and antimony phosphomolybdate blue spectrophotometry

GB/T 223.62 Methods for chemical analysis of iron, steel and alloy - The butyl acetate extraction spectrophotometric method for the determination of phosphorus content

GB/T 223.63 Methods for chemical analysis of iron, steel and alloy - The sodium periodate (potassium) photometric method for the determination of manganese content

Iron and steel - Determination of manganese content - Flame atomic absorption spectrometric method

GB/T 223.79 steel multi-element content determination by X-ray fluorescence spectrometry (conventional method)

GB/T 223.80 Steel and alloy bismuth and arsenic content - Determination of hydride generation - atomic fluorescence spectrometry

GB/T 223.81 steel and alloy total aluminum and total boron content - microwave digestion - inductively coupled plasma mass spectrometry

GB/T 223.82 steel hydrogen content Determination of inert gas pulse melting heat conduction method

GB/T 223.84 steel and alloy - Determination of titanium content - Diampyridin methane spectrophotometry