Product Details

ABOUT OUR COMPANY

we are the top 5 manufacture of precision seamless steel tube in China ,our company mainly produces various specifications cold finished steel tube ,which are widely used in hydraulic cylinder ,automobile ,oil drilling ,textil machinery,engineering machinery ,and so on

ABOUT OUR PRODUCT

Commodity name	ASTM A519 cold finished seamless hydraulic cylinder steel pipe
Surface Treatment	Oiled, Galvanized, or according to the customer’s acquirement
Technique	Cold drawn & cold rolled
Application	1hydraulic cylinder
	2. automobile
	3.oil drilling
	4.textil machinery
	5. engineering machinery
	6. printing machinery
Delivery Conditions	1. BK (+C)	No heat treatment after last cold forming process.
	2. BKW (+LC)	After last heat treatment there is a light finishing pass (cold drawing)
	3. BKS (+SR)	After the final cold forming process the tubes are stress relieve annealed.
	4. GBK (+A)	After the final cold forming process the tubes are annealed in a controlled atmosphere.
	5. NBK (+N)	After the final cold forming process the tubes are annealed above the upper transformation point in a controlled atmosphere.
Package	1. Bundle Packing.
	2. Plain end or vanished as per customer's request.
	3. Wrapped in waterproof paper.
	4. Sackcloth with several steel strips.
	5. Pack in heavy tri-wall boxes.

CHEMICAL COMPOSITION

	C	Mn	Si	S(Max)	P(Max)
CK20	0.17-0.24	0.35-0.65	0.17-0.37	0.035	0.035
CK45	0.42-0.5	0.5-0.8	0.17-0.37	0.035	0.035
St52	≤ 0.22	≤ 1.6	≤0.55	0.025	0.025
27SiMn	0.24-0.32	1.1-1.4	1.1-1.4	0.035	0.035

MECHANICAL PROPERTY

Material	Tensile strength	Yield strength	Elongation	Hardness
Ck20	510 σ N/mm2	500σsN/mm2	5δs%	175HB
Ck45	660 σN/mm2	630σsN/ mm2	4δs%	207HB
ST52	580σ N/mm2	420σsN/ mm2	10δs%	190HB
27SiMn	840σ N/mm2	805σsN/ mm2	7.5δs%	230HB

ABOUT THE TOLERANCE

+0.021 0

+0.038 0

+0.052 0

+0.084

+0.130

±5%,±10%

>30-50

+0.025 0

+0.039

+0.062 0

+0.100

+0.160

>50-80

+0.030

+0.046

+0.074 0

+0.120

+0.190

>80-120

+0.035

+0.054

+0.087 0

+0.140

+0.220

>120-180

+0.040

+0.063

+0.100 0

+0.160

+0.250

>180-250

+0.046

+0.072

+0.115 0

+0.185

+0.290

>250-315

+0.052

+0.081

+0.130 0

+0.210

+0.320

>315-400

+0.057

+0.089

+0.140 0

+0.230

+0.360

ABOUT OUR PACKAGING

(1)Delivery time: In 20 days or according to client's requires

(2)Trade terms: EXW/FOB/CIF etc

(3)Payments: T/T or L/C or according to client's requires

(4)Port: Yantai or Qingdao

(5)MOQ: 5 metric tons or at customer's demands

(6)Packing: we usually bundle with steel strips ,branding parcel or wooden box outside ,or according to the customer’s acquirement

ABOUT OUT SERVICES

(1)Delivery time: In 20 days or according to client's requires

(2)Trade terms: EXW/FOB/CIF etc

(3)Payments: T/T or L/C or according to client's requires

(4)Port: Yantai or Qingdao

(5)MOQ: 5 metric tons or at customer's demands

(6)Packing: we usually bundle with steel strips ,branding parcel or wooden box outside ,or according to the customer’s acquirement

ABOUT OUR PROCESSING

ABOUT OUR APPLICATION

Application

Cold drawn or cold rolled precision seamless steel tubes for hydraulic pressure and pneumatic services.

For Auto use,machinery use,oil cylinder tube,motorcycle shock reducer use,auto shock reducer inner cylinder,gas spring use etc.

Seamless steel pipes for low and medium pressure boiler, high pressure boiler,

ship-building,

Liquid service, petroleum cracking, chemical fertilizer equipment,Drawing-oil-equipment and structure purposes.

ABOUT OUR CERTIFICATE

testing

1.100% PMI,Spectro Chemical Aanlysis Test for Raw Material

2.100% Dimension & Visual Examination

3. Mechanical Properties Test Include Tension Test,Flaring Test (For Seamless tube/pipe)/ Flange Test (For Welded Pipe & Tube), Hardness Test ,Reversed Flattening Test

4.100% Hydrostatic Test or 100% NON-DESTRUCTIVE Test (ET or UT)

5.Radiographic Test for Welded Pipe (shall be accordance with specification,or shall be as agreed upon between the purchaser and vendor)

6.Straightness Test (optional)

7.Roughness Test (optional)

8.Intergranular Corrosion Test(optional)

9.Impact Test (optional)

10.Grain Size Determinations (optional)

NOTES : ALL THE TESTS AND INSPECTION RESULT NEED TO BE SHOWED IN REPORTS ACCORDING TO STANDARD AND SPECIFICATION.