焊接钢管经冷拔或冷轧等深加工工艺处理后

焊接钢管经冷拔或冷轧等深加工工艺处理后,得到了尺寸公差小、机械性能好的优质钢管,称作DOM钢管

液压缸筒用高精度冷拔焊管 EN10305-2 (DIN 2393)

Steel grade: E355 (ST52.3), Mill test certificate EN10204/3.1 标准材质

C 0.14-0.22 Si 0.35 max Mn 1.20-1.60 P 0.025 max S 0.025 max Cr 0.10 max Ni 0.10 max

Al 0.02-0.07 Cu 0.10 max

+SR (BK+S) 清除应力淬火

Yield Strength屈服强度: 540N/mm min.

Tensile Strength抗拉强度: 640N/mm min. Elongation延伸率: 15% min. Eccentricity偏心率: 3% 壁厚

Straightness直线度: 0.5m/1000m (根据客户要求)

Testing成品检测: EC+US=SEP1915+SEP1925

Impact Value KV冲击值: -20°C=27.5J (根据客户要

求)Cold Drawn Welded Cylinder Tubes EN10305-2 (DIN 2393)

Telescopic cylinder tubes 多级缸筒管

Supply conditions供货条件: + SR (BK+S)= Stressed relieved annealed 去应力退火

Surface finish表面精度: OD: 6.3 u max; ID: 1.6 u max

Tolerance 公差: H12 max

Dimensions on request, and based on customer drawings 尺寸按客户设计要求订制

Tubes for Hydraulic Cylinder 液压缸用冷拔焊管

The tubes for hydraulic cylinder are a Eletric – Resistance Welded (ERW) tub es Draw Over the

mandrel (DOM) products manufactured according to the EN 10305-2 , the Eur opean standard for

Welded Carbon steel mechanical cold drawn tubes

液压缸用管是通过DOM工艺拔制的电阻焊(ERW)管, 产品制造采用EN 10305-2欧盟机械冷拔碳钢焊管标准

Full body normalizing of the shell stock after welding ensures that both the w elding and the surrounding areas are metallographically and mechanically ho mogeneus with the rest of the tubes.

电阻焊(ERW)管焊接后,整体管身经过正火确保了焊缝和热影响区与其余部分在金相组织和机械性上的同质

Cold drawing and the subsequent heat tratment ( Usually Stress Relief +SR) p roduces a tube with excellent dimensions and mechanical properties.

冷拔及后续热处理(通常消除应力+SR)的钢管具有良好的尺寸和机械性能

Cold Drawn welded tube are reccomended for both mechanical and pressure applications.

冷拔焊管适用于机械和压力容器领域

In addition , the merits of the Welded tubes offer an opportunity for considerab le cost Saving over seamless tubing in the form of initial cost and reducing ma

chining cost.

另外,冷拔焊管相对于冷拔无缝管在初始成本和降低机床加工成本上具有明显优势

Why A Cold Drawn Welded Tube is Better Than Seamless Cold Drawn冷拔焊管相对于冷拔无缝管具有比较优势

Better Shape (Od and Id roundness) 较好的成形 (外径和内径的圆度) Improved Quality Surface (less defect after painting and improve fatigue life) 较好的表面质量(涂漆后较少缺陷并提高了抗疲劳寿

命)Tight Excentricity and Wall Thickness Tollerances(The eccentricity is 3% m ax instead of 7 % normally

guarantee from SS tubes)

较好的偏心率和臂厚公差(偏心率:冷拔焊管最大为3%, 而冷拔无缝管通常为7%) Tube More Safety(Tubes are Controlled 100 % by Ultrasonic Test, Seamless are controlled only with Eddy

Current test)

更加安全(冷拔焊管必须通过整体管身涡流探伤+超声波探伤检测, 而冷拔无缝管通常只做涡流探伤)

Good Toughness at Low Temperature

良好的低温韧性

USA Market : 90 % of the cylinder in the USA market are produced with welde d tubes ( D.O.M. tubes)

美国油缸市场: 冷拔焊管(DOM管)占美国油缸市场份额的90%

Cost Fix Lengths More Cheaper

更低的剪切定尺成本Some of Our Customer :