Product Details

Product name : ck20 Ck 45 precision cold rolled steel tube with tight tolerance

We offer an extensive range of seamless precision steel tubes. The seamless precision steel tubes can be used for a wide range of precision mechanical spare for car and cylinder accord to standard DIN2391/ EN10305-1/ GB/T3639-2009.

Processing: Cold drawn or cold rolled (Burnish or other requirements can be agreed)

Length: ≤10m

Straightness:0.3~0.8mm/m

Wall Thickness tolerance: ±10%

Inner roughness: 0.8~1.6μm

Dimensional Accuracy:

1. Tolerance on Inner Diameter: H8 H9

2. Tolerance on Wall Thickness:

Diameter: >40 +/-0.2mm

Diameter: 40 <100 +/-0.3mm

Diameter >100 +/-0.5mm

3. Surface Roughness: a=0.3~0.4micron

Length: Random length4.5-6m or as per order confirmation

Mill Test Certification: En10204/3.1B

4. Delivery condition: BKS

Main products of Yantai Xinpeng Steel Pipe Co,.Ltd

1. Hydraulic Cylinder Tube------Main products of Xinpeng,

Used in the hydraulic cylinder of the heavy machinery, Cranes, excavator also forklifts. Material is various, mainly STKM-13CT ST52 CK45 and 1020. We can work and get the mechanical property of the clients need and extended the life of the hydraulic cylinder.

2.SRB tube ----- used inElevatorbuffer and Hydraulic Cylinder .This kind tube have a better roughness inner the tube, ra0.2-0.4um and can use directly in the hydraulic cylinder tube. Range: ID 50-250mm and Length can work at most 6M.

3. Cold finished tube---- Widely Used. Processing range 30-300mm, biggest length is 11M.

Xinpeng Have passed ISo9001 verified from 2008; each tube of ours is strictly in quality control that can assure the product quality of Xinpeng.

Technique Parameter

Material	(OD)(mm)	(ID) (mm)	(Tolerance)
Material	(OD)(mm)	(ID) (mm)	OD(mm)	ID(mm)	W.T(mm)	Ovality	Curvature
20# 45# Q345D 25Mn 42CrMo 27SiMn St35 St45 St52 St52.4 STKM13CT A519 …	40-74	30-65	±0.01	-0.3,-0.5	≤0.5	≤0.1	0.3
	74-98	65-85	±0.01	-0.4,-0.6	≤0.5	≤0.15	0.3
	100-116	85-100	±0.02	-0.4,-0.6	≤0.6	≤0.15	0.3
	124-134	110-115	±0.02	-0.6-0.8	≤0.6	≤0.20	0.3
	140-158	120-135	±0.02	-0.7,-0.9	≤0.8	≤0.20	0.3
	165-176	140-150	±0.02	-0.7,-0.9	≤0.8	≤0.20	0.3
	188-203	160-180	±0.02	-0.7,-0.9	≤0.8	≤0.20	0.3

For Honed /SRB tube standard Tolerance

ID size	ID deviation (mm)
ID size	H7	H8	H9	H10
30	+0.021 0	+0.033 0	+0.052 0	+0.084 0
>30~50	+0.025 0	+0.039 0	+0.062 0	+0.100 0
>50~80	+0.030 0	+0.046 0	+0.074 0	+0.120 0
>80~120	+0.035 0	+0.054 0	+0.087 0	+0.140 0
>120~180	+0.040 0	+0.063 0	+0.100 0	+0.160 0
>180~250	+0.046 0	+0.072 0	+0.115 0	+0.185 0
>250~315	+0.052 0	+0.081 0	+0.130 0	+0.210 0
>315~400	+0.0527 0	+0.089 0	+0.140 0	+0.230 0

Material Range of Yantai Xinpeng

Steel Grade
DIN	1629	ST 37 / 44 / 52
	1630	ST 37.4 / 44.4 / 52.4
	2391-2	ST 35 / 45 / 52
EN	17204	C22 – Ck 22 – Cm22 – C35 – Ck 35 – Cm 35 C45 - Ck 45 – Cm 45 – 34 CrMo4
	17210	C15 – Ck 15 – Cm 15 – 16MnCr5
	10305-1	E215/235/355/255 26Mn 5 C35E C45E 20V1 (E410) 26Mo2 25CrMo4 42CrMo4
GB	3639	10#, 20#, 16Mn, 45#
ASTM	A 519	1010 1020 1035
	A179-A450	A450
	A822-A450	A450
BS	BS 6323	CFS3 CFS4 CFS5 CFS6 CFS7
NFA	49310	TU 37 b TU 52 XC

Process :

Delivery conditions:

Precision tubes are delivered in following conditions

BK (+C) Cold finished/hard (cold finished as drawn).
No heat treatment after last cold forming process.
BKW (+LC) Cold finished/soft
After last heat treatment there is a light finishing pass (cold drawing).
BKS (+SR) Cold finished/stress relieve annealed.
After the final cold forming process the tubes are stress relieve annealed.
GBK (+A) Annealed.
After the final cold forming process the tubes are annealed in a controlled atmosphere.
NBK (+N) Normalized.
After the final cold forming process the tubes are annealed above the upper transformation point in a controlled atmosphere.

Tests: 100% eddy current test, chemical and mechanical inspection, size checking and others

Yan Tai Xinpeng Steel Pipe Co., Ltd. was established in December, 1992, with the registered capital of 5 million Yuan. Xinpeng Company Locatedin Yantai which is one of the beautiful coast city of China.

Our plant and office cover an area of 12,000sqm, with the total area of 20,000sqm.
Our company mainly produces various specifications of cold-drawn precision seamless steel tubes and hydraulic precision cylinders also honed tube. Sell the seamless tube also the cold drawn welded tube (Dom tube_ from Italy Marcegalia.
Our products are widely used in such industries as:
hydro-cylinders, automobiles, engineering machinery, textile machinery, printing machinery, oil drilling, etc.

Welcome to inquiry at any time, we will try our bes