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金属材料 管 压扁试验方法
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GBT 246-2017
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标准编号: GB/T 246-2017 (GB/T246-2017)
中文名称: 金属材料 管 压扁试验方法
英文名称: Metallic materials -- Tube -- Flattening test
行业: 国家标准 (推荐)
中标分类: H23
国际标准分类: 77.040.10
字数估计: 4,487
发布日期: 2017-07-12
实施日期: 2018-04-01
旧标准 (被替代): GB/T 246-2007
采用标准: ISO 8492-2013, IDT
起草单位: 中华人民共和国常熟出入境检验检疫局、浙江金洲管道科技股份有限公司、国家钢铁及制品质量监督检验中心、冶金工业信息标准研究院
归口单位: 全国钢标准化技术委员会(SAC/TC 183)
提出机构: 中国钢铁工业协会
发布机构: 中华人民共和国国家质量监督检验检疫总局、中国国家标准化管理委员会
范围: 本标准规定了测定圆形横截面金属管塑性变形能力的压扁试验方法，也可用来揭示其缺陷。除相关产品标准规定以外，本标准适用于外径不超过600 mm且壁厚不超过外径15%的金属管。
GB/T 246-2017: 金属材料 管 压扁试验方法
GB/T 246-2017 英文名称: Metallic materials -- Tube -- Flattening test
1 范围
本标准规定了测定圆形横截面金属管塑性变形能力的压扁试验方法,也可用来揭示其缺陷。
除相关产品标准规定以外,本标准适用于外径不超过600mm且壁厚不超过外径15%的金属管。
2 符号、名称和单位
本标准使用的符号、名称和单位见表1和图1。
a 在钢管标准中也用其他符号表示此参数。
3 试验原理
对从垂直于金属管纵轴线方向截取的规定长度的金属管试样或金属管端部试样施加力进行压扁
[见图1a)和图1b)],直至在力的作用下两压板之间的距离达到相关产品标准所规定的值。
如为闭合压扁,试样内表面接触区域的宽度应至少为正常压扁后试样内宽度b的一半[见图1c)]。
4 试验设备
试验机应能将试样压扁至规定的两平行压板之间的距离H。压板应具有足够刚度。
压板的宽度应超过压扁后的试样宽度,即至少为1.6D。压板的长度应不小于试样的长度。
5 试样
5.1 试样长度L 应不小于10mm,但不超过100mm。试样的棱边允许用锉或其他方法将其倒圆或
倒角。
注:如果试验结果满足试验要求,可以不对试样的棱边倒圆或倒角。
5.2 当在一根全长度管的管端进行试验时,应在距管端面为试样长度处垂直于管纵轴线切割,且切割深度应至少达外径的80%。
6 试验程序
6.1 试验一般应在10℃~35℃的室温范围内进行。对温度要求严格的试验,试验温度应为23℃±
5℃。
6.2 试样置于两压板之间。
6.3 焊接管的焊缝应置于相关产品标准所规定的位置。
6.4 沿垂直于管纵轴线方向移动压板进行压扁。
6.5 若有争议,压板的移动速率不应超过25mm/min。
6.6 对压扁试验结果的评定应根据相关产品标准的要求。当产品标准中没做规定时,在不使用放大镜的情况下,如果无可见裂纹,应评定为合格。仅在试样棱角处的轻微开裂不应作为判废依据。
7 试验报告
如适用,应根据相关产品标准的要求提供试验报告。试验报告至少应包含下列内容:
a) 本标准编号;
b) 试样标识;
c) 试样尺寸;
d) 力作用下两压板之间的距离(H);
e) 如为焊接管,焊缝的位置;
f) 试验结果。
GB/T 246-2017
Metallic materials.Tube.Flattening test
ICS 77.040.10
H23
National Standards of People's Republic of China
Replacing GB/T 246-2007
Metal material tube flattening test method
(ISO 8492.2013, IDT)
Published on.2017-07-12
2018-04-01 Implementation
General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China
China National Standardization Administration released
Foreword
This standard was drafted in accordance with the rules given in GB/T 1.1-2009.
This standard replaces GB/T 246-2007 "Metal tube flattening test method", compared with the main technical changes in GB/T 246-2007
as follows.
---The name of the standard was changed to "Metal Material Tube Flattening Test Method";
--- Modified the expression of "scope" (see Chapter 1);
--- Table 1 and Figure 1 respectively increase the list of questions and map questions; modify the note in Table 1 wall thickness symbols (see Table 1, Figure 1);
--- Modify the expression of "Test Principle" (see Chapter 3);
--- Editorial changes made to the "test procedure" (see Chapter 6);
--- The original standard Chapter 7 d) "platen spacing" to "force under the pressure plate between two (H)".
This standard uses the translation method equivalent to the use of ISO 8492.2013 "metal material tube flattening test method."
This standard has made the following editorial changes.
--- Table 1 and Figure 1 increase the list of topics and questions.
This standard is proposed by the China Iron and Steel Industry Association.
This standard is under the jurisdiction of the National Steel Standardization Technical Committee (SAC/TC183).
This standard was drafted by the People's Republic of China Changshu Exit Inspection and Quarantine Bureau, Zhejiang Jinzhou Pipeline Technology Co., Ltd., and the State.
Steel and Products Quality Supervision and Inspection Center, Metallurgical Industry Information Standards Institute.
The main drafters of this standard. Wang Weizhong, Lu Shuyuan, Yang Weifang, Liu Yan, Dong Li, Yue Yu, Xu Haibin, and Huang Fei.
The previous versions of the standards replaced by this standard are.
--- GB 246-1963, GB 246-1982, GB/T 246-1997, GB/T 246-2007.
Metal material tube flattening test method
1 Scope
This standard specifies the flattening test method for determining the plastic deformability of a round cross-section metal tube and can also be used to reveal its defects.
Except for the relevant product standards, this standard applies to metal pipes whose outer diameter does not exceed 600mm and whose wall thickness does not exceed 15% of the outer diameter.
2 symbols, names and units
The symbols, names, and units used in this standard are shown in Table 1 and Figure 1.
Table 1 Symbols, Names, and Units
Symbol name unit
Aa Wall thickness mm
b Internal width of the specimen after crushing mm
D Metal tube outer diameter mm
The distance between the two pressure plates under H force mm
L sample length mm
a The steel pipe standard also uses other symbols to indicate this parameter.
3 Test principle
Force flattening by applying force to a specified length of metal tube specimen or metal tube end specimen taken perpendicular to the longitudinal axis of the tube.
[See Fig. 1a) and Fig. 1b)] until the distance between the two platens under the force has reached the value specified in the relevant product standard.
If closed, the width of the contact area on the inner surface of the specimen shall be at least half the width b of the specimen after normal collapse (see Figure 1c)].
a) b) c)
Figure 1 Squishing test
4 test equipment
The tester shall be able to flatten the specimen to the distance H between the specified two parallel pressure plates. The platen should have sufficient rigidity.
The width of the platen should exceed the width of the flattened sample, ie at least 1.6D. The length of the platen should not be less than the length of the sample.
5 samples
5.1 The length L of the specimen shall not be less than 10mm, but not more than 100mm. The edge of the specimen is allowed to be rounded or otherwise rounded or
Chamfer.
Note. If the test results meet the test requirements, you can not round or chamfer the edge of the sample.
5.2 When testing on the pipe end of a full-length pipe, cut perpendicular to the longitudinal axis of the pipe at the length of the sample from the end face of the pipe and cut it.
The depth should be at least 80% of the outside diameter.
6 Test procedures
6.1 The test should generally be performed at a room temperature of 10°C to 35°C. For temperature-critical test, the test temperature should be 23°C±
5°C.
6.2 The sample is placed between two pressure plates.
6.3 Welds welded pipe should be placed in the position specified by the relevant product standards.
6.4 Move the pressure plate perpendicular to the longitudinal axis of the tube to flatten it.
6.5 If in dispute, the platen's movement rate should not exceed 25mm/min.
6.6 The evaluation of the crush test results shall be based on the requirements of the relevant product standards. When not specified in the product standard, no magnifier is used
In the absence of visible cracks, it shall be assessed as acceptable. Only slight cracks at the corners of the specimen should not be used as a basis for rejection.
If applicable, test reports shall be provided in accordance with the requirements of relevant product standards. The test report should contain at least the following contents.
a) the standard number;
b) sample identification;
c) sample size;
d) The distance (H) between the two pressure plates under the force;
e) if welded pipe, the location of the weld;
f) Test results.
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