GB/T 35740-2017 in English
VALIDSpecification of nickel and nickel alloy castings for industrial valves
- Issued on:2017-12-29
- Implemented on:2018-07-01
- File Format:PDF
- Delivery:Via email within 1~3 business days
$156.00
| Standard No: | GB/T 35740-2017 |
| Document status: | VALID |
| Title in English: | Specification of nickel and nickel alloy castings for industrial valves |
| Title in Chinese: | 工业阀门用镍和镍基合金铸件技术条件 |
| Language: | English |
| File Format: | Electronic (PDF) |
| Delivery: | Via email within 1~3 business days |
| Issued on: | 2017-12-29 |
| Implemented on: | 2018-07-01 |
| ICS Classification: | 23.060.01-Valves in general |
| Chinese Classification: | J16-Valve |
| Professional Classification: | GB-National Standard |
| Related Keywords: | nickel alloy castings
industrial valves industrial valves introduction introduction national standard nickel-based alloy castings pressure castings |
| Related Topics: | casting technology
Industrial Nickel Aluminum castings for non-industrial use Fund conditions Nitinol Technology industrial valve alloy casting Technical conditions for valves used in coal chemical plants F GBT35740 GB/T 35740-2017 nickel EU Nickel Alloy Castings Department of Energy Nickel Base Alloy Forgings Nickel-based alloy pipe fittings Valve Casting |
《GB/T 35740-2017工业阀门用镍和镍基合金铸件技术条件》由TC188（全国阀门标准化技术委员会）归口，主管部门为中国机械工业联合会。
Introduction
Introduction
National Standard of the People's Republic of China GB/T 35740-2017 "Technical Conditions for Nickel and Nickel-Based Alloy Castings for Industrial Valves" is a technical specification for nickel and nickel-based alloy castings in the field of industrial valves. This standard aims to ensure that castings meet industry requirements in terms of chemical composition, mechanical properties, heat treatment and non-destructive testing, and is applicable to the casting of nickel (Ni), nickel-copper (Ni-Cu), nickel-molybdenum (Ni-Mo), nickel-chromium-iron (Ni-Cr-Fe) and nickel-chromium-molybdenum (Ni-Cr-Mo) alloys.
Comparison of Standard Frameworks
| Dimensions | Technical Requirements | Test Methods | Allowable Deviation |
|---|---|---|---|
| Chemical Composition | Table 1 specifies the chemical composition requirements for nickel and nickel-based alloys in detail, including the content limits of elements such as carbon (C), manganese (Mn), phosphorus (P), and sulfur (S). | GB/T222 and GB/T223 (all parts) | ≤0.02% |
| Mechanical Properties | Table 2 specifies the requirements for tensile strength, yield strength, and elongation, and sets specific indicators based on the characteristics of different grades of alloys. | GB/T 228.1—2010 | ±5MPa |
| Heat treatment requirements | Table 3 specifies the specific temperature range for solution treatment and stabilization treatment according to different alloy grades. | - As-cast: no additional heat treatment required;- Solution treatment: ≥1095℃ or higher;- Stabilization treatment: ≥940℃ | ±5℃ |
Technical requirements interpretation
Casting process
Sand casting is the main production method, especially for pressure castings with nominal pressure ≥PN63 or nominal size ≥DN50. The standard requires the use of sequential solidification process and avoids the use of investment casting process (4.1.3.1). Sand molds and sand cores should use molding materials that do not contain benzenesulfonic acid as a curing agent (4.1.1).
Chemical composition control
The chemical composition of nickel and nickel-based alloy castings is strictly controlled within the range specified in Table 1. For example, the carbon content of Ni-Cu alloy should be ≤0.30%, and the copper content should be between 90% and 95% (taking CZ100 as an example). These requirements ensure the corrosion resistance and mechanical properties of the alloy.
Implementation suggestions
- Strictly control the procurement of raw materials to ensure that the furnace and bar materials meet the requirements of the vacuum refining process (4.1.2).
- In radiographic testing and penetration testing, focus on the level control of cracks and pores (4.6).
- For castings that require weld repair, argon arc welding is preferred, and ensure that the number of post-weld heat treatments does not exceed two times (4.7).
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