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GB/T 718-2024Pig iron for casting (English PDF)

铸造用生铁

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Issued by

SAMR; SAC

Level / Type

National · Recommended

Issue date

May 28, 2024

Implementation date

December 1, 2024

Scope

GB/T 718-2024 is the English-translated version of 铸造用生铁.

GB/T 718-2024 is the Chinese standard for foundry pig iron, the charge material a grey iron or ductile iron foundry melts. It is one of the oldest standards in the system and one of the most used, because pig iron is bought by the shipload and the grade is what the price is set from.

What distinguishes the grades is the silicon content and the limits on the elements that ruin a casting: phosphorus, sulfur, manganese, and above all the trace elements that interfere with nodularisation in ductile iron, so the standard is in practice a specification for what must not be in the material.

The document sets the grades and their designation, the chemical composition of each, the requirements on the form and the size of the pigs and on the surface condition, the sampling and the preparation of samples, the analytical methods referred to, the inspection rules including the batching and the retest, and the marking and the accompanying quality certificate.

The 2024 edition replaces GB/T 718-2005. For a blast furnace producer, a foundry or a trader in China, this is the acceptance text.

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Document preview — GB/T 718-2024

National Standard of the People's Republic of China

Replacing: GB/T 718-2005

Issued by: State Administration for Market Regulation; Standardization Administration of the PRC

1 Scope
2 Normative references
3 Terms and definitions
4 Classification and designation
5 Technical requirements
6 Test methods
7 Inspection rules
8 Packaging, storage, transportation and quality certificate

Foreword

This document specifies the classification and designation, technical requirements, test methods, inspection rules, as well as packaging, storage, transportation and quality certificate of pig iron for casting.

This document is applicable to the production and application of pig iron for gray cast iron, pig iron for spheroidal graphite cast iron and high purity pig iron for foundry.

1 Scope

This document is applicable to the production and application of pig iron for gray cast iron, pig iron for spheroidal graphite cast iron and high purity pig iron for foundry.

2 Normative references

The following documents contain provisions which, through reference in this text, constitute provisions of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.

GB/T 223.3 Methods for chemical analysis of iron, steel and alloy - The diantipyryl methane phosphomolybdate gravimetric method for the determination of phosphorus content

GB/T 223.5 Steel and iron - Determination of acid-soluble silicon and total silicon content - Reduced molybdosilicate spectrophotometric method

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

GB/T 223.13 Methods for chemical analysis of iron, steel and alloy - The ammonium ferrous sulfate titration method for the determination of vanadium content

GB/T 223.14 Methods for chemical analysis of iron, steel and alloy - The N-benzoy-N-phenylhydroxylamine extraction photometric method for the determination of vanadium content

GB/T 223.17 Methods for chemical analysis of iron, steel and alloy - The diantipyrylmethane photometric method for the determination of titanium content

GB/T 223.18 Methods for chemical analysis of iron, steel and alloy - The sodium thiosulfate separation iodimetric method for the determination of copper content

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

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 potometric method for the determination of antimony 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 223.59 Iron, steel and alloy - Determination of phosphorus content - Bismuth phosphomolybdate blue spectrophotometric method and antimony phosphomolybdate blue spectrophotometric method

GB/T 223.60 Methods for chemical analysis of iron, steel and alloy - The perchloric acid dehydration gravimetric method for the determination of silicon content

GB/T 223.61 Methods for chemical analysis of iron, steel and alloy - The ammonium phosphomolybdate volumetric method for the determination of phosphorus content

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