Cold drawn precision seamless Steel Tube
鋼管內外壁無氧化層，承受高壓無泄漏，尺寸高精度，外表面高光潔度，冷彎不變形，擴口壓扁無裂縫，成品經以無氧介質熱處理，以德國（歐盟）DIN 2391/EN10305-1為生產標準，經過精密獨特的冷拔/冷軋工藝制成尺寸精度高，光潔度較好的精密無縫鋼管，進過無氧介質熱處理后內外表面均無氧化皮（膜）生成，保持了原有鋼管尺寸精度與光潔度，有改善了鋼管內外在性能，可適合各類深加工，用于各類車輛制造業的輸油、輸氣（剎車制動）流體輸送系統，包括客車，轎車，火車機車，各類工程機械（挖掘機，推土機，高空作業特殊車輛，清掃車，混凝土泵本等），適宜于與各類卡套接頭連接，其效果優于普通鋼管，可替代同標準的進口無縫管。
Concentricity and straightness
Strong wear resistance, High concentricity and Good straightness
We can control Straightness within 0.5/1000 which makes tubes easy for processing, machining and improve the processing efficiency and quality of finished products.
具體性能表現在
尺寸公差：每一道都通過精密拉拔， 嚴格控制成品和半成品內外徑壁厚公差。
外徑公差可控制在+/-0.03
外徑公差可控制在+/-0.05
也可按客戶特殊要求生產
Tolerance
Each drawing process is controlled strictly to minimum the tube inner and outer diameter Tolerance
OD tolerance can be controlled +/-0.03
ID tolerance can controlled +/-0.05
Other special requirements of tolerance can also be adopted
表面 （粗糙度）
通過稱心拉拔技術和油拉技術，可以使內外表面光滑無毛刺。無氧退火進一步使光潔度高如鏡面狀態。 成品表面粗糙度在0.2um以內， 內外壁無任何氧化皮屑，此鋼管運用在氣動，液壓，油路方面不會出現任何堵塞現象。可以保證氣，液流動正常。
Surface roughness
Tube is drawn by mandrel and oil of each process so that the outer and inner surface is very smooth without any burr. Normalizing process makes the surface more shinning like mirror. Surface roughness can be controlled within Ra 0.2. No oxidized residual substances enable the hydraulic fluid and pneumatic gas go through the tube fluently.
同心度直線度高
鋼管的耐磨性強，同心度，直線度能控制比較好。直線度能控制在0.5/1000， 這樣可以減少客戶使用過程中深加工，磨車削工序的工作量，提高成品合格率和工作效率。
性能：可承受高壓， 各角度冷彎，抗拉， 擴口，壓扁不爆裂，無裂紋。鋼管的延伸和強度較好，可滿足客戶直接進行不同需求的后道加工處理。
用途: 液壓系統,汽車用, 其他高清潔度,機械性能要求高的部件
交貨狀態：
NBK(+N)
GBK(+A)
BK(+C)
BKW(+LC)
BKS(+SR)
表面處理：除光亮退火外，也可鍍鋅處理。 鋅層厚度8um以上， 銀白色鍍鋅， 黃色鍍鋅，橄欖綠鍍鋅.。
Mechanical Properties
The tube can be bent at any figure and bear the impact of high pressure, cold bending, flaring and flattening without any crack and breaks. The tube is with good elongation and tensile strength so different machining process can be arranged without special treatment.
Usage: Automotive industry, hydraulic system and other machine parts for high standard surface and mechanical properties.
Delivery condition:
NBK(+N)
GBK(+A)
BK(+C)
BKW(+LC)
BKS(+SR)
Surface Coating:
Color: Silver, yellow or olive green
Thickness: above 8um as per customer needs
Salty spray test hours: 48hours to 200hours as per customer needs.