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对于镀锌管生产的技术要求

来源:http://www.n-impact20.com

【 发布于:2019-04-03 15:45:51 】


1、牌号和化学成分

1. Brand and Chemical Constituents

镀锌钢管用钢的牌号和化学成分应契合GB 3091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 black Pipe Steels specified in GB 3091。

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 3091的规则。

20171214963168.jpg

4. Mechanical properties of steel pipes before galvanizing should conform to the rules of GB 3091.

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 diameter 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最终运用性能(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。

Mechanical property of steel is an important index to ensure the ultimate performance (mechanical property) of steel, 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,在拉断时所接受的最鼎力(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最大才能。计算公式为:

During the tensile process, the maximum force (Fb) that the specimen receives at break is the stress (_) obtained by the original cross-sectional area (So) of the specimen, which is called tensile strength (_b) in units of N/mm2 (MPa). It represents the greatest ability of metal materials to withstand damage under tension. The calculation formula is as follows:

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

In the formula: Fb - the maximum force accepted when the specimen is broken, 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 phenomena, 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最大应力; 下屈从点(σsl):当不计初始瞬时效应时,屈从阶段中的最小应力。

Upper yield point (_su): the maximum stress before the initial drop of the force due to the initiation of the specimen, and downward yield point (_sl): the minimum stress in the yield stage when the initial instantaneous stress is not taken into account.

屈从点的计算公式为:

The formula for calculating the yield point is as follows:

式中:Fs--试样拉伸过程中屈从力(恒定),N(牛顿)So--试样原始横截面积,mm2。

In the formula: Fs - the yield force (constant) during the tensile process of the specimen, N (Newton) So - the original cross-sectional area of the specimen, mm2.

③断后伸长率(σ)

(3) elongation after breaking (_)

在拉伸实验中,试样拉断后其标距所增加的长度与原标距长度的百分比,称为伸长率。以σ表示,单位为%。计算公式为:

In the tensile test, the percentage of the length of the standard distance increased by the sample after breaking to the length of the original standard distance is called elongation。 In_, the unit is。 The calculation formula is as follows:

式中:L1--试样拉断后的标距长度,mm; L0--试样原始标距长度,mm。

In the formula: L1 - the length of standard distance after specimen breaking, mm; L0 - the original length of standard distance of specimen, mm.

④断面收缩率(ψ)

(4) Section shrinkage (_)

在拉伸实验中,试样拉断后其缩径处横截面积的最大缩减量与原始横截面积的百分比,称为断面收缩率。以ψ表示,单位为%。计算公式如下:

In tensile test, the percentage of the maximum reduction of cross-sectional area at the shrinkage of specimen after breaking to the original cross-sectional area is called the cross-sectional shrinkage rate。 In_, the unit is。 The calculation formula is as follows:

式中:S0--试样原始横截面积,mm2; S1--试样拉断后缩径处的最少横截面积,mm2。

Formula: S0 - the original cross-sectional area of the specimen, mm2; S1 - the minimum cross-sectional area at the shrinkage point of the specimen after breaking, mm2.

⑤硬度指标

Hardness index

金属资料抵御硬的物体压陷外表的才能,称为硬度。依据实验办法和适用范围不同,硬度又可分为布氏硬度、洛氏硬度、维氏硬度、肖氏硬度、显微硬度和高温硬度等。关于管材普通常用的有布氏、洛氏、维氏硬度三种。

The ability of metal materials to resist the collapse of hard objects is called hardness。 The hardness can be divided into Brinell hardness, Rockwell hardness, Vickers hardness, Shore hardness, microhardness and high temperature hardness。 Brinell hardness, Rockwell hardness and Vickers hardness are commonly used for pipes。

A、布氏硬度(HB)

A. Brinell Hardness (HB)

用一定直径的钢球或硬质合金球,以规则的实验力(F)压入式样外表,经规则坚持时间后卸除实验力,丈量试样外表的压痕直径(L)。布氏硬度值是以实验力除以压痕球形外表积所得的商。以HBS(钢球)表示,单位为N/mm2(MPa)。

A steel ball or cemented carbide ball with a certain diameter is pressed into the surface of the sample with regular experimental force (F). The experimental force is removed after the regular adherence time, and the indentation diameter (L) of the sample surface is measured. Brinell hardness is a quotient obtained by dividing the experimental force by the surface product of indented spheres. In terms of HBS (steel ball), the unit is N/mm2 (MPa).



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