GB/T 32219-2026 Cylinder mill—Cast grinding cylpebs English, Anglais, Englisch, Inglés, えいご
This is a draft translation for reference among interesting stakeholders. The finalized translation (passing through draft translation, self-check, revision and verification) will be delivered upon being ordered.
ICS
CCS
National Standard of the People's Republic of China
GB/T 32219-2026
Cylinder mill - Cast grinding cylpebs
筒式磨机 铸造磨段
Issue date: 2026-01-28 Implementation date: 2027-02-01
Issued by the General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China
the Standardization Administration of the People's Republic of China
Contents
Foreword
1 Scope
2 Normative references
3 Terms and definitions
4 Designation and code
5 Technical requirements
6 Test methods
7 Inspection rules
8 Marking, certificate of conformity, packaging, transport and storage
Annex A (Normative) Determination and calculation of breakage ratio
Annex B (Normative) Calculation of cylpebs consumption
Tube mill — Cast grinding segments
1 Scope
This document specifies the designation and code, technical requirements, inspection rules, marking, certificate of conformity, packaging, transport and storage for cast grinding segments, and describes the corresponding test methods.
This document applies to the design, production and inspection of chromium alloy cast iron cast grinding segments (hereinafter referred to as "cast grinding segments") used as grinding media in tube mills.
2 Normative references
The contents of the following documents constitute essential provisions of this document through normative reference. For dated references, only the edition cited applies. For undated references, the latest edition (including all amendments) applies.
GB/T 223.11 Iron, steel and alloy — Determination of chromium content — Titration method and spectrophotometric method
GB/T 223.18 Methods for chemical analysis of iron, steel and alloy — The sodium thiosulfate separation iodometric method for the determination of copper content
GB/T 223.23 Iron, steel and alloy — Determination of nickel content — Dimethylglyoxime spectrophotometric method
GB/T 223.26 Iron, steel and alloy — Determination of molybdenum content — Thiocyanate spectrophotometric method
GB/T 223.59 Iron, steel and alloy — Determination of phosphorus content — Molybdenum blue spectrophotometric method and phosphomolybdenum blue spectrophotometric method
GB/T 223.60 Iron, steel and alloy — Determination of silicon content — Gravimetric method
GB/T 223.64 Iron, steel and alloy — Determination of manganese content — Flame atomic absorption spectrometric method
GB/T 223.71 Methods for chemical analysis of iron, steel and alloy — The gravimetric method after combustion in the pipe furnace for the determination of carbon content
GB/T 223.72 Iron, steel and alloy — Determination of sulfur content — Gravimetric method
GB/T 230.1 Metallic materials — Rockwell hardness test — Part 1: Test method
GB/T 4699.2 Ferrochromium, silicochromium, nitrogen-bearing ferrochromium and high nitrogen ferrochromium — Determination of chromium content — The ammonium persulfate oxidation titration method and potentiometric titration method
GB/T 5611 Foundry terms
GB/T 5612 Code for representing cast iron grades
GB/T 20066 Steel and iron — Sampling and preparation of samples for the determination of chemical composition
GB/T 24234 Cast iron — Determination of multi-element contents — Spark discharge atomic emission spectrometric method (Routine method)
3 Terms and definitions
For the purposes of this document, the terms and definitions given in GB/T 5611 and the following apply.
3.1 cast grinding cyclops
A grinding medium used in a tube mill, having an approximately cylindrical shape with a length to diameter ratio of less than 2.0.
3.2 diameter tolerance
The difference between the maximum or minimum diameter required on the same cast grinding segment and the nominal diameter.
3.3 length tolerance
The difference between the maximum or minimum length required for a cast grinding segment and the nominal length.
3.4 breakage ratio of cylpebs
The percentage of the weight of broken segments to the total weight of cast grinding segments used.
NOTE: A cast grinding segment is considered broken when its surface area (excluding the cross sectional area) is not more than 2/3 of the surface area of the segment.
3.5 cylpebs consumption
Under normal production operating conditions of a tube mill, the ratio of the weight of cast grinding segments consumed to the total weight of material ground.
4 Designation and code
4.1 The designation of chromium alloy cast iron cast grinding segments specified in this document specifies only the main alloying elements and their contents. It shall comply with GB/T 5612, and the alloying element contents shall be expressed as integers.
4.2 The code representation method for cast grinding segments is as follows:
5 Technical requirements
5.1 Delivery condition
Cast grinding segments shall be supplied in one of the following conditions:
a)As cast;
b) As cast with stress relief;
c) Hardened;
d) Hardened and tempered.
5.2 Specifications and dimensional tolerances
The specifications and dimensional tolerances of cast grinding segments shall comply with the provisions of Table 1.
5.3.2 Appropriate amounts of elements such as Mo, Cu, Ni and trace amounts of V, Ti, Nb, Zr, B, RE may be added to the cast grinding segments.
5.4 Hardness, breakage ratio and cylpebs consumption
5.4.1 The surface hardness of cast grinding segments shall comply with the provisions of Table 3.
Table 3 — Surface hardness of cast grinding segments
5.4.2 ZDcr12 to ZDcr35 cast grinding segments shall not be supplied in the as cast or as cast with stress relief condition.
5.4.3 The hardness difference between the surface and the geometric centre of cast grinding segments shall be less than or equal to 2 HRC.
5.4.4 The breakage ratio of cast grinding segments shall be less than or equal to 1%.
5.4.5 Whether the length of cast grinding segments is to be taken as an acceptance item shall be agreed upon between the supplier and the purchaser.
5.5 Casting defects
Cast grinding segments shall be free from casting defects such as cracks that affect their use.
5.6 Permissible surface defects
The permissible surface defects of cast grinding segments shall comply with the provisions of Table 4.
Table 4 — Permissible surface defect dimensions of cast grinding segments
