GB/T 13447-2008 in English
VALIDSteel blank for seamless gas cylinder
- Issued on:2008-08-26
- Implemented on:2009-09-01
- File Format:PDF
- Delivery:Via email within 1~3 business days
$97.00
| Standard No: | GB/T 13447-2008 |
| Document status: | VALID |
| Title in English: | Steel blank for seamless gas cylinder |
| Title in Chinese: | 无缝气瓶用钢坯 |
| Language: | English |
| File Format: | Electronic (PDF) |
| Delivery: | Via email within 1~3 business days |
| Issued on: | 2008-08-26 |
| Implemented on: | 2009-09-01 |
| Superseding: |
GB 13447-1992 Steel blank for seamless gas cylinder
|
| ICS Classification: | 77.140.60-Steel bars and rods |
| Chinese Classification: | H43-Steel ingot and billet |
| Professional Classification: | GB-National Standard |
| Related Keywords: | seamless gas cylinder introduction
seamless gas cylinders high-pressure seamless gas cylinders gas cylinder steel blank |
| Related Topics: | billet
Cylinder sampler Cylinder sampler Gas Gas cylinder specifications Nitrogen cylinder made of steel miniature steel cylinder GBT13447 GB/T 13447-2008 Use of hydrogen cylinders gb/t13447 Gas bottles for drones gb/t 13447-2006 |
本标准规定了无缝气瓶用钢坯的尺寸、外形、重量及允许偏差、技术要求、试验方法、检验规则、包装、标志及质量证明书。
本标准适用于制造高压无缝气瓶用钢坯。
Introduction
1. Background and significance of the standard
GB/T13447-2008 "Steel Billets for Seamless Gas Cylinders" is a national standard of the People's Republic of China, which is used to regulate the quality of steel billets for manufacturing high-pressure seamless gas cylinders. This standard was issued in 2008, replacing the previous GB13447-1992 version, and became a recommended standard in 2017.
2. Comparison of standard frameworks
| Standard items | GB13447—1992 | GB/T13447—2008 |
|---|---|---|
| Normative reference documents | Not explicitly listed | Added and detailed provisions |
| Grade and chemical composition | Including 40Mn2, 40Mn2A, etc. | Add 37Mn, 34CrMo, cancel 40Mn2 series |
| Dimensional tolerance | Some specifications are not clear | New specifications such as 230mm×230mm, 250mm×250mm, etc. |
3. Technical requirements interpretation
3.1 Size and shape
The size deviation of the billet is a key indicator of product quality. According to Table 1, the allowable deviation of the side length and the difference in diagonal length of billets of different specifications are strictly regulated. For example, the allowable deviation of the side length of a 280mm×280mm billet is ±8.0mm, and the difference in diagonal length does not exceed 11mm.
| Specifications | Allowable deviation of side length | Difference of diagonal length |
|---|---|---|
| 200×200 | ±4.5 | ≤6 |
| 230×230 | ±5.0 | ≤8 |
3.2 Chemical composition requirements
Chemical composition is the basis of billet performance. Table 2 lists the chemical composition ranges of billets of different grades, including the content limits of carbon (C), silicon (Si), manganese (Mn) and other elements. For example, the carbon content of 34Mn2V steel billet is 0.30-0.37%, and the manganese content is 1.40-1.80%.
| Grade | C（%） | Mn（%） | P+S（%） |
|---|---|---|---|
| 34Mn2V | 0.30～0.37 | 1.40～1.80 | ≤0.050 |
| 37Mn | 0.34～0.40 | 1.40～1.75 | ≤0.060 |
3.3 Mechanical properties
Mechanical properties are important indicators for measuring the quality of steel billets. Table 3 lists the yield strength, tensile strength and other requirements of different grades of steel billets in different states. For example, the yield strength of 34Mn2V steel billets in the quenched and tempered state is ≥550MPa, and the tensile strength is ≥780MPa.
| Grade | State | Yield Strength (ReL, MPa) | Tensile Strength (Rm, MPa) |
|---|---|---|---|
| 34Mn2V | Quenched and Tempered | ≥550 | ≥780 |
| 37Mn | Quenched and Tempered | ≥640 | ≥760 |
4. Implementation Suggestions
4.1 Material Selection Suggestions
Select the appropriate steel billet grade according to the design pressure of the gas cylinder and the use environment. For example, 30CrMo or 34CrMo grades are recommended for high-pressure gas cylinders, whose mechanical properties meet higher requirements.
4.2 Inspection and quality control
Manufacturers should establish a complete inspection system and conduct chemical composition analysis, mechanical property testing and macrostructure inspection in strict accordance with the standards. It is recommended to use the GB/T10561 method to evaluate the level of non-metallic inclusions.
4.3 Production process optimization
It is recommended to use the continuous casting process to produce steel billets, and the central porosity level can be determined through negotiation between the supply and demand parties. For the die casting process, special attention should be paid to the control of white spots and cracks.
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