GB/T 33966-2017 in English
VALIDSeamless abrasion-resistant steel pipes for mortar service
- Issued on:2017-07-12
- Implemented on:2018-04-01
- File Format:PDF
- Delivery:Via email within 1~3 business days
$136.00
| Standard No: | GB/T 33966-2017 |
| Document status: | VALID |
| Title in English: | Seamless abrasion-resistant steel pipes for mortar service |
| Title in Chinese: | 输送砂浆用耐磨无缝钢管 |
| Language: | English |
| File Format: | Electronic (PDF) |
| Delivery: | Via email within 1~3 business days |
| Issued on: | 2017-07-12 |
| Implemented on: | 2018-04-01 |
| ICS Classification: | 77.140.75-Steels pipes and tubes for specific use |
| Chinese Classification: | H48-Steel tube and cast iron pipe |
| Professional Classification: | GB-National Standard |
| Related Keywords: | seamless abrasion-resistant steel pipes
wear-resistant seamless steel pipe steel pipes steel pipe technology steel pipe |
| Related Topics: | mortar
GB/T33966-2017 seamless steel pipe GBT33966 GB/T 33966-2017 Mortar abrasion Liquid conveying seamless steel pipe Plastic pipe mortar wear amount Sand mill transportation requirements Wear-resistant steel wear resistance Quartz tube standards for transportation |
《GB/T 33966-2017输送砂浆用耐磨无缝钢管》由TC183（全国钢标准化技术委员会）归口，TC183SC1（全国钢标准化技术委员会钢管分会）执行，主管部门为中国钢铁工业协会。
Introduction
GB/T 33966—2017 Standard Overview
GB/T 33966—2017 "Wear-resistant Seamless Steel Pipe for Mortar Transportation" is a special steel pipe standard formulated by China for the field of mortar transportation, aiming to ensure the wear resistance and reliability of steel pipes when conveying media such as concrete, cement mortar and slurry.
Background of Standard Formulation
With the rapid development of the construction and mining industries, the demand for steel pipes for mortar transportation is increasing. In order to meet the requirements of high performance and long life, the China Iron and Steel Association jointly drafted this standard with a number of companies, filling the domestic technical gap in this field.
Technology Evolution Analysis
This standard combines the internationally advanced wear-resistant steel pipe manufacturing technology, introduces alloy element control, heat treatment process optimization and non-destructive testing methods, and represents the highest level of steel pipe technology in China in the field of mortar transportation.
Grade designation method
| Grade example | Grade meaning |
|---|---|
| NM60 | NM stands for wear resistance, and 60 means the minimum Rockwell hardness after heat treatment is 60HRC. |
| NM55 | NM stands for wear resistance, and 55 means the minimum Rockwell hardness after heat treatment is 55HRC. |
Allowance of size and wall thickness
Allowance of outer diameter and wall thickness of steel pipe is as follows:
| Item | Tolerance range |
|---|---|
| Outer diameter D | ±0.75% D |
| Wall thickness S (S≤8) | +12.5%S -10.0%S |
| Wall thickness S (>8) | ±10.0%S |
Chemical composition requirements
Table 2 lists the chemical composition requirements of different grades to ensure that the steel pipe has excellent wear resistance:
| Grade number | C (%) | Si (%) | Mn (%) | P (%) | S (%) |
|---|---|---|---|---|---|
| NM50 | 0.42～0.49 | 0.17~0.37 | ≤0.025 | ≤0.025 | |
| NM55 | 0.52～0.60 | 0.17～0.37 | ≤0.025 | ≤0.025 | |
| NM60 | 0.62~0.70 | 0.17~0.37 | ≤0.025 | ≤0.025 | |
| NM62 | 0.55～0.63 | 0.17～0.37 | 1.10~1.50 | ≤0.025 | ≤0.025 |
Implementation Suggestions
In actual application, it is recommended that users:
- Choose a suitable grade according to the abrasive degree of the conveying medium.
- Ensure that the delivery state of the steel pipe meets the standard requirements (annealing after hot rolling or cold drawing).
- Perform strict non-destructive testing and surface quality inspection before installation.
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