cold rolled round precision seamless steel honed tube for hydraulic cylinder

Standard	GB / T 3639-2000
Material	10#, 20#, 35#, 45#
Surface treatment	Oiled, phosphate etc
Produce OD	6-65mm
Wall Thickness	1-8mm
Delivery condition	BK, BKW, BKS, GBK, NBK
Steel Tube Grade	1010 (10#, STS38,STKM11A,STKM12A,STKM13C, A106 Gr.A,St35.8, St37,St35,E215 etc) 1020 (20#, STPG42,STKM12B,STKM12C,STKM13A,STKM13B,A106Gr.B, A53.B, St45.8,St44, St45, E235 etc) 1045 (45#)
Packing Details	1.Internal wrapped with plastic film. External wrapped with woven bags. 2. wooden boxes to pack. 3. Iron stand.
Certification	ISO9001
Length	1-12m as customer's requestment

Delivery Condition	Specification
BK ( +C )	Tubes don't undergo heat treatment following the final cold forming,thus have a rather high resistance to deformation
BKW ( +LC )	The final heat treatment is follwed by cold drawing involving limted deformation. Appopriate further processing allows a certain degree of cold droming( eg: handing expanding)
BKS ( +SR )	Heat treatment is applied following the last cold forming process, subject to appropriate procession conditions, the increate in the residual stresses,involved enables both forming and maching to a certain degress.
GBK ( +A )	The last cold forming process followed by annealing in controlled atmosphere.
NBK (+N )	The last cold forming process is followed by annealing above the upper transformation point in a controlled atmosphere.

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