This standard specifies the product classification, technical requirements, test methods, inspection rules, packaging, marking and transportation of chromium alloy cast iron grinding balls and nodular cast iron grinding balls

This standard applies to metallurgy, power, building materials, and chemical industries, used for grinding and grinding ore, coal, and cement and other related materials chromium alloy cast iron grinding ball and ductile iron  grinding ball production line.

The terms in the following documents become the terms of this standard by reference. All subsequent amendments (excluding corrigendum) or revisions to dated references do not apply to this standard. However, parties to an agreement under this standard are encouraged to study them Whether the latest version of these files is available. The latest edition of any undated reference document applies to this standard.

The terms in the following documents become terms of this international standard by reference. All subsequent amendments (excluding errata) or revisions to dated references shall not apply to this standard. However, parties that have reached an agreement under this standard are encouraged to explore the possibility of using the latest versions of these documents. The latest edition of any undated reference document applies to this standard.

GB / T 223.    Methods for chemical analysis of iron, steel, and alloy   

The diantipyrylmethane phosphate key acid gravimetric method for the determination of phosphorus content

GB / T 223.4   Iron, steel and alloy  determination of manganese content

Potentiometric or visual titration method

GB / T 223.11  Iron, Steel and alloy  determination of chromium content

Visual or potentiometric titration (GB / tT223.11-2008, ISO 4937:1986, MOD)

GB/T 223. 18  Methods for chemical analysis of iron, steel, and alloy

The sodium thiosulfate method for the determination of copper content

GB/T 223.23  Iron, Steel, and alloys  determination of nickel content  Diketone fat spectrophotometry

GB/T 223. 26  Iron, Steel and alloys  determination of Molybdenum content 

The thiocyanate spectrophotometric method

GB/T 223. 28  Methods for chemical analysis of iron, steel, and alloys  

α- Benzoin Oxime gravimetric method for the determination of Molybdenum content

GB/T 223. 60   Methods for chemical analysis of iron, steel, and alloys

Determination of silicon content by perchloric acid dehydration gravimetric method

GB/T 223. 63  Methods for chemical analysis of iron, steel, and alloys

Spectrophotometric determination of manganese with sodium periodate (potassium)

GB/T 223. 67   Iron, Steel and alloys  Determination of sulfur content

Methyl-blue spectrophotometry (GB/T 223. 67 2008, ISO 10701： 1994,IDT)

GB/T 223.69  Iron, Steel and alloys  Determination of carbon content

Method of post-combustion gas volume in a tubular furnace

GB/T 223.72  Determination of sulfur content  Gravimetric Method

GB/T 230. 1   Rockwell hardness test  

Part 1: Test Methods (A、B、C、D、E、F、G、H、K、N、T) scales

GB/T 230. 2   Rockwell hardness test

Part 2: Verification and calibration of testing machines (scales A,B,C,D,E,F,G,H,K,N,T),MOD]

GB/T 230. 3 Rockwell hardness test

Part 3: Calibration of reference blocks (scales A,B,C,D,E,F,G, H,K,N,T) ,MOD]

GB/T 1348  Nodular iron castings

GB/T 5611 Foundry term

GB/T 5612  Description method of cast iron grade (GB/T 5612 2008.1SO/TR 15931 ：2004,MOD)

GB/T 7216  Metallographic examination of gray cast iron (GB/T 7216—2009, ISO 945-1:2008) Part l : Ciraphite classification by visual analysis.MOD)

GB/T 8170  Rounding and the expression and determination of limit value

GB/T 8263  Abrasion resistant white cast iron (GB/T 8263 1999.eqv ASTM A532/A532M:1993)

GB/T 9441 Metallographic examination of ductile iron (GB/T 9441 -2009. ISO 945-1： 2008, Microstructure of cast irons Part 1: Graphite dassifieahun by visual analysis. MOD)

GB/T 13298  Method for the examination of the microstructure of metals