GB/T 26651-2025 PDF English
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GB/T 26651-2025: Abrasion-resistant steel castings---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GBT26651-2025
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 77.140.80
CCS J 31
Replacing GB/T 26651-2011
Abrasion-Resistant Steel Castings
Issued on: MAY 30, 2025
Implemented on: DECEMBER 1, 2025
Issued by. State Administration for Market Regulation;
Standardization Administration of the People’s Republic of China.
Table of Contents
Foreword... 3
1 Scope... 5
2 Normative References... 5
3 Terms and Definitions... 7
4 Designation... 7
5 Manufacturing... 9
6 Technical Requirements... 10
7 Test Methods... 12
8 Inspection Rules... 14
9 Marking, Certificate of Conformity, Packaging, Transportation, and Storage... 18
Abrasion-Resistant Steel Castings
1 Scope
This Document specifies the designation, manufacturing, technical requirements, test methods,
inspection rules, marking, certificate, packaging, transportation, and storage requirements for
abrasion-resistant steel castings (hereinafter referred to as "castings") other than austenitic
manganese steel.
This Document applies to the production, testing, application, procurement, and delivery
acceptance of abrasion-resistant steel castings subject to abrasive wear in the mining,
metallurgy, building materials, electric power, construction, railway, shipbuilding, chemical,
and machinery industries. Abrasion-resistant steel castings for other operating conditions shall
be implemented as a reference.
2 Normative References
The provisions in following documents become the essential provisions of this Document
through reference in this Document. For the dated documents, only the versions with the dates
indicated are applicable to this Document; for the undated documents, only the latest version
(including all the amendments) is applicable to this Document.
GB/T 222 Permissible tolerances for chemical composition of steel products
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 Titration
or Potentiometric Titration 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
GB/T 223.23 Iron, steel and alloy - Determination of nickel content - The
dimethylglyoxime spectrophotometric method
GB/T 223.26 Iron, Steel and Alloy - Determination of Molybdenum Content - The
Thiocyanate Spectrophotometric Method
GB/T 223.59 Iron, steel and alloy - Determination of phosphorus content - Bismuth
phosphomolybdate blue spectrophotometric method and antimony phosphomolybdate
of steel castings
GB/T 40805-2021 Steel castings - General technical delivery requirements
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 Major welding repair
The welding repair for the depth of the groove prepared for the welding repair surface exceeds
25 mm or 40% of the wall thickness, or the welding repair of a single excavation area exceeds
64 cm2.
4 Designation
The designation expression method for wear-resistant steel and its castings complies with the
provisions of GB/T 5613.Wear-resistant steel and its castings are classified into three categories
based on their primary microstructure and into 20 designations based on their alloy element
content, as shown in Table 1.
5 Manufacturing
5.1 Casting and heat treatment
5.1.1 Unless otherwise agreed upon between the supplier and the purchaser, the melting method
and casting process shall be determined by the supplier.
5.1.2 Martensitic wear-resistant steel castings may be directly quenched and tempered; bainitic
wear-resistant steel castings may be austempered and tempered; and pearlitic wear-resistant
steel castings may be normalized and tempered. Unless otherwise agreed upon between the
supplier and the purchaser, the heat treatment process shall be determined by the supplier.
5.2 Repair welding
5.2.1 Casting defects may be repaired by welding. A welding procedure qualification shall be
conducted prior to repair welding in accordance with GB/T 40800.Defective areas of the
casting shall be cleaned before repair welding. Repair welding shall not affect the performance
or appearance of the casting. Unless otherwise specified, the repair welding process shall be
determined by the supplier.
5.2.2 Whether or not a casting shall undergo further heat treatment after extensive weld
repairing shall be agreed upon between the supplier and the purchaser.
5.2.3 Major welding repair must be approved in advance by the purchaser. The location and
extent of any major welding repair should be documented in sketches or photographs; and
documentation shall be provided to the purchaser.
5.3 Correction
If deformation occurs, the casting may be corrected. This correction of the casting shall be
performed by pressure forming.
6 Technical Requirements
6.1 Chemical composition
6.1.1 The principal chemical composition of each designation shall comply with the provisions
of Table 1.
6.1.2 The allowable deviation of chemical composition shall comply with the provisions of
GB/T 222.
6.2 Hardness and impact toughness
The hardness and impact toughness of wear-resistant steel and its castings at room temperature
shall comply with the provisions of Table 2.
6.4.2 The gates, risers, burrs, flash, and sand deposits on the castings must be cleaned. The
residual volume after grinding at the gate and riser roots must comply with the provisions of
the drawing or order contract.
6.4.3 The surface finishing (mechanical) treatment level, surface non-metallic inclusion level,
and surface porosity level of the castings may be agreed upon by the supplier and purchaser in
accordance with the provisions of GB/T 39428.
6.4.4 The surface roughness parameter levels of the castings must comply with the provisions
of the drawing or order contract. If not specified in the drawings or order contract, the supplier
shall select. The surface roughness parameters for castings weighing less than 1,000 kg per
piece shall comply with Rα ≤ 25 μm specified in GB/T 1031; or comply with the provisions of
BM2 level specified in GB/T 39428-2020.While the surface roughness parameters for castings
weighing no less than 1,000 kg per piece shall comply with Rα ≤ 100 μm specified in GB/T
1031; or comply with the provisions of BM3 level specified in GB/T 39428-2020.
6.5 Internal quality
6.5.1 Castings shall be free of cracks and casting defects that affect performance, such as slag
inclusions, sand inclusions, pores, shrinkage cavities, and porosity, etc.
6.5.2 Castings may contain defects that do not affect performance. The type, range, quantity,
and size of these defects shall be agreed upon by both the supplier and the purchaser.
6.6 Geometric shape and dimension
6.6.1 The geometric shape and dimensional deviations of castings shall comply with the
provisions of the drawings or order contract.
6.6.2 Unless otherwise specified in the drawings or order contract, the dimensional deviations
of castings shall comply with the provisions of DCTG 12 level specified in GB/T 6414-2017;
and the geometric deviations shall comply with the provisions of GCTG 7 level specified in
GB/T 6414-2017.
6.7 Weight
The weight deviations of castings shall comply with the provisions of the drawings or order
contract. Unless otherwise specified in the drawings or order contract, the weight deviation
level shall comply with the provisions of MT11 level specified in GB/T 11351-2017.
7 Test Methods
7.1 Chemical Composition
7.1.1 The sampling and preparation methods for chemical composition determination shall
implemented according to the provisions of GB/T 20066.When multiple ladles of molten steel
are used to cast a single casting, each ladle must undergo chemical composition analysis and
meet the corresponding technical requirements.
7.1.2 Chemical analysis methods shall be implemented according to the provisions of GB/T
223.4, GB/T 223.11, GB/T 223.18, GB/T 223.23, GB/T 223.26, GB/T 223.59, GB/T 223.60,
GB/T 223.64, GB/T 223.69, and GB/T 223.72.Spark discharge atomic emission spectrometry,
X-ray fluorescence spectrometry, and other analytical methods are permitted. In the event of a
dispute over the analytical results, the results of the chemical analysis method shall prevail.
7.1.3 When residual elements need to be specified, the type, content, and total amount of the
residual elements shall be determined by mutual agreement between the supplier and the
purchaser.
7.2 Hardness and impact test
7.2.1 Rockwell hardness test shall be conducted in accordance with the provisions of GB/T
230.1.
7.2.2 Impact test shall be conducted in accordance with the provisions of GB/T 229.
7.3 Microstructure examination
Microstructure examination shall be conducted in accordance with the provisions of GB/T
13298.
7.4 Surface quality
7.4.1 Surface quality test of castings shall be conducted in accordance with the provisions of
GB/T 39428.
7.4.2 Penetrant test of castings shall be conducted in accordance with the provisions of GB/T
9443.
7.4.3 Magnetic particle test of castings shall be conducted in accordance with provisions of
GB/T 9444.
7.4.4 The surface roughness of castings shall be conducted in accordance with the provisions
of GB/T 15056.Alternatively, visual comparison test may be conducted using comparison
photographs. The comparison photographs shall comply with the surface roughness comparison
photographs in Appendix C of GB/T 39428-2020.
7.5 Internal quality
7.5.1 Ultrasonic test of castings shall be conducted in accordance with the provisions of GB/T
7233.1.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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