舞阳钢铁20号钢数控切割加工，规格8mm-300mm之间

一、20号钢简介：舞阳钢铁20号钢数控切割加工，规格8mm-300mm之间，保性能钢板请联系景隆钢铁杨辰

20号钢也可写作20#钢，是一种碳素结构钢板，表明该钢中C含量为0.20%，归于低碳钢。20号钢强度较低、耐性、塑性和焊接性较好，首要用于制造轿车、拖拉机、机械设备职业中的各种零部件。

二、20号钢的的交货状况和履行规范：

交货状况：以热轧或热处理状况交货，热处理包含正火、退火、高温回火。也可根据需求附加探伤规范要求、探伤等级要求、合金元素成分操控要求等，但需经供需双方交流，并签定书面协议。舞阳钢铁20号钢数控切割加工，规格8mm-300mm之间，保性能钢板请联系景隆钢铁杨辰

履行规范：履行GB/T711-2017规范，也可履行企业规范，但需提早与出产方洽谈。

三、20号钢的化学成分：

1、钢中剩余元素铬、镍、铜含量供方若能确保合格，可不进行剖析。

2、氧气转炉锻炼的钢其含氮量应不大于0.008%，供方能确保合格，可不进行剖析。

3、制品钢板的化学成分答应误差应契合GB/T222的规则。

四、20号钢的力学性能：

其间20号钢板的屈从抗拉强度的名词解析：舞阳钢铁20号钢数控切割加工，规格8mm-300mm之间，保性能钢板请联系景隆钢铁杨辰

a.屈从点（σs）：钢材或试样在拉伸时，当应力弹性极限，即便应力不再添加，而钢材或试样仍持续产生显着的塑性变形，称此现象为屈从，而产生屈从现象时的小应力值即为屈从点。设Ps为屈从点s处的外力，Fo为试样断面积，则屈从点σs =Ps/Fo(MPa)。

b.屈从强度（σ0.2）：有的金属资料的屈从点极不显着，在丈量上有困难，因而为了衡量资料的屈从特性，规则产生剩余塑性变形等于必定值（一般为原长度的0.2%）时的应力，称为条件屈从强度或简称屈从强度σ0.2。

c.抗拉强度（σb）：资料在拉伸过程中，从开端到产生开裂时所到达的大应力值。它表明钢材反抗开裂的才能巨细。与抗拉强度相应的还有抗压强度、抗弯强度等。设Pb为资料被拉断前到达的大拉力，Fo为试样截面面积，则抗拉强度σb= Pb/Fo（MPa）。

d.伸长率（δs）：资料在拉断后，其塑性伸长的长度与原试样长度的百分比叫伸长率或延伸率。

e.屈强比（σs/σb）：钢材的屈从点（屈从强度）与抗拉强度的比值，称为屈强比。屈强比越大，结构零件的可靠性越高，一般碳素钢屈强比为0.6-0.65，低合金结构钢为0.65-0.75合金结构钢为0.84-0.86。

五、20号钢的外表质量要求：

1、钢板不得有目视可见分层，钢板外表不该有裂纹、气泡、折叠、搀杂、结疤和压入氧化皮等对运用有害的缺点。

2、钢板不答应有阻碍查看外表缺点的薄层氧化铁皮或铁锈及凹凸度不大于钢板厚度公役之半的麻点、凹面、划痕及其他部分缺点，且应确保钢板答应小厚度。

3、钢板外表部分缺点答应整理，整理处应滑润无棱角，并应确保钢板答应小厚度。

4、厚度大于30mm的钢板答应火焰切边，但需热处理的钢板，应在热处理前进行。

六、20号钢板使用：舞阳钢铁20号钢数控切割加工，规格8mm-300mm之间，保性能钢板请联系景隆钢铁杨辰

20号钢板用于船只、桥梁、锅炉、各种机械构件、耐磨构件、金属结构和各种工磨具,也可用于制造大型电机、各类泵的外壳及底座及制造各类钢的铆、栓、焊结构件。

 舞阳钢铁20号钢数控切割加工，规格8mm-300mm之间，保性能钢板请联系景隆钢铁杨辰

I. Introduction to No. 20 Steel:

No.20 steel, also known as No.20 steel, is a high quality carbon structural steel plate, indicating that the C content of the steel is 0.20%, classified as low carbon steel.No. 20 steel has low strength, good durability, plasticity and weldability. It is mainly used for manufacturing various parts of cars, tractors and mechanical equipment.

Ii. Delivery status and performance specifications of Steel No. 20:

Delivery status: delivery in hot rolling or heat treatment status, heat treatment includes normalizing, annealing, high temperature tempering.According to the requirements, additional inspection specification requirements, inspection grade requirements, alloy element composition control requirements, etc., should be communicated between the supply and demand parties, and a written agreement should be signed.

Fulfillment specification: fulfill GB/T711-2017 specification, also fulfill enterprise specification, but need to negotiate with the manufacturer in advance.

Iii. Chemical composition of Steel No. 20:

Steel plate trademark

C

Si

Mn

P

S

Cr

Ni

Cu

20

0.17-0.23

0.17-0.37

0.35-0.65

0.035 or less

0.03 or less

0.20 or less

0.30 or less

0.25 or less

1. If the content of the remaining elements chromium, nickel and copper in steel is qualified, the supplier may not analyze it.

2. The nitrogen content of the steel exercised by the oxygen converter should not be more than 0.008%. The supplier can ensure that it is qualified without analysis.

3, the steel plate chemical composition error should conform to the rules of GB/T222.

Iv. Mechanical properties of No. 20 steel:

Steel plate trademark

Tensile strength

Elongation after fracture %

20° longitudinal V-shaped impact absorption energy

A 20℃ longitudinal V-shaped impact absorption energy

20

P 410

P 28

p

27 or higher

Meanwhile, the yield tensile strength of no. 20 steel plate.

A. Point of submission (S) : The point of submission when the stress exceeds the elastic limit and the steel or specimen continues to undergo significant plastic deformation even when the stress is no longer added. The minimum value of the stress is the point of submission.If Ps is the external force at the point S and Fo is the breaking area of the sample, then the point s =Ps/Fo(MPa).

B. Yield strength (0.2) : There are metals where the yield point is so insignificant that it is difficult to measure the yield characteristic of the data that the rule produces a permanent residual plastic deformation equal to the stress at a certain value (usually 0.2% of the original length). This is called conditional yield strength or simply yield strength 0.2.

C. Tensile strength (B) : The maximum stress reached during stretching from the beginning to the cracking.It shows the strength of steel's resistance to cracking.And the tensile strength corresponding to the compressive strength, flexural strength and so on.Let Pb be the maximum tension reached before the data is broken, and Fo is the cross section area of the sample, then tensile strength b= Pb/Fo (MPa).

D. Elongation (s) : The percentage of the plastic elongation of the material relative to the length of the original specimen after being stretched is called elongation or elongation.

E. Strength ratio: the ratio of the yield point (strength of yield) to tensile strength of steel. This is called the strength ratio.The higher the flexural strength ratio is, the higher the reliability of structural parts will be. The flexural strength ratio of general carbon steel is 0.6-0.65, and that of low alloy structural steel is 0.65-0.75, which is 0.84-0.86.

V. External quality requirements of No.20 steel:

1, steel plate shall not have visual stratification, steel plate appearance should not have cracks, bubbles, folding, mixing, scarring and pressing into oxide skin and other harmful shortcomings to use.

2. The steel plate shall not have the defects of thin oxide sheet or rust, and the concavity shall not be greater than the thickness of the steel plate. The pitting, concave surface, scratch and other partial defects of the public service shall be ensured that the minimum thickness of the steel plate shall be allowed.

3, steel plate surface defects allow finishing, finishing place should be smooth without edges and corners, and should ensure that the steel plate to allow the minimum thickness.

4, the thickness of more than 30mm steel plate allowed flame cutting, but the steel plate to be heat treatment, should be carried out before the heat treatment.

Vi. Use of No. 20 steel plate:

No.20 steel plate is used for ships, Bridges, boilers, various mechanical components, wear resistant components, metal structures and various grinding tools, as well as for the manufacture of large motors, the shell and base of all kinds of pumps and the manufacture of riveting, bolts and welding structural parts of all kinds of steel.