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济南镀锌管的生产应该符合哪些标准?

来源:http://www.jnxxjm.com

【 发布于:2019-05-29 16:11:22 】


1、牌号及化学成分

1. Brand and Chemical Constituents

镀锌钢管用钢的牌号和化学成分应契合GB 3092所规则的黑管用钢的牌号和化学成分。

The grades and chemical compositions of galvanized steel pipes shall conform to the grades and chemical compositions of the black Pipe Steels specified in GB 3092.

2、制造办法

2. Manufacturing methods

黑管的制造办法(炉焊或电焊)由制造厂选择。镀锌采用热浸镀锌法。

The manufacturing method of black pipe (furnace welding or electric welding) is chosen by the manufacturer. Hot dip galvanizing is used for galvanizing.

3、螺纹及管接头

3. Thread and pipe fittings

3.1 带螺纹交货的镀锌钢管,螺纹应在镀锌后车制。螺纹应契合YB 822的规则。

3.1 For galvanized steel pipes delivered with threads, threads shall be made after galvanizing. Threads shall conform to the rules of YB 822.

3.2 钢制管接头应契合YB 238的规则;可锻铸铁管接头应契合YB 230的规则。

3.2 Steel pipe joints shall conform to the rules of YB 238; malleable cast iron pipe joints shall conform to the rules of YB 230.

4、力学性能 钢管镀锌前的力学性能应契合GB 3092的规则。

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4. Mechanical properties of steel pipes before galvanizing should conform to the rules of GB 3092.

5、镀锌层的平均性镀锌钢管应作镀锌层平均性的实验。钢管试样在硫酸铜溶液中连续浸渍5次不得变红(镀铜色)。

5. The average galvanized steel pipe should be tested for the average galvanized layer. The steel tube specimen shall not turn red (copper-plated) after five consecutive dips in copper sulfate solution.

6、冷弯曲实验公称口径不大于50mm的镀锌钢管应作冷弯曲实验。弯曲角度为90°,弯曲半径为外径的8倍。实验时不带填充物,试样焊缝处应置于弯曲方向的外侧或上部。实验后,试样上不应有裂痕及锌层剥落同象。

6. Galvanized steel pipes with nominal caliber less than 50 mm should be cold-bended. The bending angle is 90 degrees and the bending radius is 8 times of the outer diameter. There is no filler in the experiment. The weld of the sample should be placed on the outside or upper part of the bending direction. After the experiment, there should be no cracks and zinc layer spalling in the sample.

7、水压实验水压实验应在黑管停止,也可用涡流探伤替代水压实验。实验压力或涡流探伤比照试样尺寸应契合GB 3092的规则。

7. Hydraulic pressure experiment should be stopped in the black tube, and eddy current testing can be used instead of hydraulic pressure experiment. Test pressure or eddy current testing shall conform to the rule of GB 3092 as compared with sample size.

钢材力学性能是保证钢材运用性能(机械性能)的重要指标,它取决于钢的化学成分和热处置制度。在钢管规范中,依据不同的运用请求,规则了拉伸性能(抗拉强度、屈从强度或屈从点、伸长率)以及硬度、韧性指标,还有用户请求的高、低温性能等。

The mechanical property of steel is an important index to ensure its performance (mechanical property), which depends on the chemical composition and heat treatment system of steel. In the steel pipe specification, according to different application requirements, the tensile properties (tensile strength, yield strength or yield point, elongation) and hardness, toughness index, as well as the high and low temperature properties requested by users are regulated.

①抗拉强度(σb)

(1) Tensile strength (_b)

试样在拉伸过程中,在拉断时所接受的鼎力(Fb),出以试样原横截面积(So)所得的应力(σ),称为抗拉强度(σb),单位为N/mm2(MPa)。它表示金属资料在拉力作用下抵御毁坏的大才能。计算公式为:

The stress (_) obtained from the original cross-sectional area (So) of the specimen is called tensile strength (_b) in units of N/mm2 (MPa). It represents the ability of metal materials to withstand destruction under tension. The calculation formula is as follows:

式中:Fb--试样拉断时所接受的鼎力,N(牛顿); So--试样原始横截面积,mm2。

In the formula: Fb - the strength accepted by the specimen at break, N (Newton); So - the original cross-sectional area of the specimen, mm2.

②屈从点(σs)

(2) yield point (_s)

具有屈从现象的金属资料,试样在拉伸过程中力不增加(坚持恒定)仍能继续伸长时的应力,称屈从点。若力发作降落时,则应辨别上、下屈从点。屈从点的单位为N/mm2(MPa)。

For metal materials with yielding phenomenon, the stress at which the specimen can continue to elongate without increasing the force during the tensile process (insisting on constant) is called the yield point. If the force attacks and falls, the upper and lower yielding points should be distinguished. The unit of yield point is N/mm2 (MPa).

上屈从点(σsu):试样发作屈从而力初次降落前的大应力; 下屈从点(σsl):当不计初始瞬时效应时,屈从阶段中的小应力。

Upper yield point (su): The large stress before the initial drop of the force due to the initiation of the specimen; Downward yield point (sl): The small stress in the yield stage when the initial instantaneous stress is not taken into account.



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