#  ### companynews ### 济南镀锌钢管的不同物理性能

【 发布于：2020-09-16 17:21:35 】

1、 Hardness index

The ability of a metal material to resist the indentation of a hard object is called hardness. Hardness can be divided into Brinell hardness, Rockwell hardness, Vickers hardness, shore hardness, microhardness and high temperature hardness according to different test methods and application scope. For pipe materials, Brinell hardness, Rockwell hardness and Vickers hardness are commonly used.

2、 Yield point Jinan galvanized pipe price has yield phenomenon of metal materials, specimen in the tensile process does not increase (keep constant) can continue to extend the stress, called yield point. If the force drops, the upper and lower yield points should be distinguished. The unit of wholesale yield point of Jinan galvanized pipe is n / mm2 (MPA).

The upper yield point (σ Su): the maximum stress before the first decrease of the stress due to the yield of the specimen; the lower yield point (σ SL): the minimum stress in the yield stage when the initial instantaneous effect is ignored. The calculation formula of yield point is as follows: FS is the yield stress (constant) in the tensile process of the sample, n (Newton) so -- the original cross-sectional area of the sample, mm2.

3、 Tensile strength

During the tensile process, the maximum force (FB) that the specimen bears during breaking is the stress (σ) obtained from the original cross-sectional area (so) of Shandong galvanized pipe, which is called tensile strength (σ b), and the unit is n / mm2 (MPA). It represents the maximum ability of a metal material to resist failure under tension. The calculation formula is as follows: FB -- the maximum force borne by the specimen during breaking, n (Newton); so -- the original cross-sectional area of the sample, mm2. 4、 Elongation after fracture

In the tensile test, the percentage of the length increased by the gauge length to the original gauge length after the specimen is broken is called elongation. Expressed in σ, the unit is%. The calculation formula is as follows: L1 -- gauge length of sample after breaking, mm; l0 -- original gauge length of sample, mm.

5、 Reduction of area

In the tensile test, the percentage of the maximum reduction of the cross-sectional area at the reduced diameter and the original cross-sectional area of the sample after breaking is called the reduction of area. Represented by ψ, the unit is%. The calculation formula is as follows: S0 is the original cross-sectional area of the sample, mm2; S1 is the minimum cross-sectional area of the reduced diameter after breaking, mm2.