Fabricated Telescopic Cylinder Semi Finished Chromed Tube Honed Tube

• Customization: Available
• After-sales Service: 3 Years
• Warranty: 3 Years
• Model NO.: bks-chrome
• Technique: Cold Drawn
• Material: Carbon Steel
• Surface Treatment: Oiled
• Usage: Pipeline Transport, Boiler Pipe, Hydraulic/Automobile Pipe, Oil/Gas Drilling, Food/Beverage/Dairy Products, Machinery Industry, Chemical Industry, Mining, Construction & Decoration, Special Purpose
• Section Shape: Round
• Surface: Black Varnished/3PE/3lpe/Galvanized
• Pipe Ends: Plain or Bevel Ends
• Coupling: with Coupling or Socket
• Length: 1m~12m
• Production Standard: SAE1020/1045/1026 St45 Ck45 St52 E355
• Material Grade: C20/C45/S355/E355/S235/St37/St52/St44
• Product Name: Cold Drawn Seamless Honed Precision Tube
• Package: Plywood Boxes
• ID Tolerance: 0.1mm Max
• Straightness: 1/1000
• ID Roughness: Ra 0.4micron(Max)
• Tolerance: H7 H8 H9 H10
• Delivery Condition: Bk, Bks, Nbk
• Inspection: Inner Surface NDT(Nondestructive Testing)
• Transport Package: Wrapped by Plastic Bags Andsteel Strips in Bundles
• Specification: OD: 16~400mm; THK: 3~40mm
• Trademark: Boerking
• Origin: Tianjin, China
• HS Code: 73041930
• Production Capacity: 10000ton/Year

Product Description

chrome tube

PRODUCT INTRODUCTION
The honed pipe is processed by rolling, and the residual stress on the surface of the steel pipe has a good sealing effect on the micro cracks on the surface and can prevent the surface from being eroded. This improves the corrosion resistance of the surface and reduces the generation and expansion of cracks, thus strengthening the compressive strength of honing tubes. By rolling the quilted tube, a layer of cold work hardening layer can be formed on the surface, reducing the elastic and plastic deformation of the contact surface of the grinding side, thus improving the wear resistance and avoiding burns caused by grinding. After rolling, the surface roughness is greatly reduced and the compatibility of the quilted tube is improved.

The so-called rolling processing is a chip free processing, at room temperature using metal plastic deformation, so that the surface of the roughness of the ground, so as to achieve the ultimate goal of changing the surface structure, mechanical characteristics, properties and size. This rolling machining technology can not be achieved by grinding, and meet the requirements of finishing and strengthening at the same time.

The principle of rolling processing is to use the cold plastic characteristics of metal at normal temperature, using rolling tools to exert a certain pressure on the workpiece, so that the surface metal of the workpiece plastic flow, so as to reduce the roughness of the workpiece surface. Due to the plastic deformation of the surface metal being rolled, the surface tissue is cold hardened and the grain becomes fine, forming a dense fiber shape, improving the hardness and strength of the metal, improving the wear resistance, corrosion resistance and compatibility of the workpiece surface.

According to DIN/ASTM/EN standard, production specifications: ∮40 ~ 800mm, the annual output is 25,000 tons, and the length of high-precision cold drawing pipe and honing pipe within 14m is 28,000 tons. The products are widely used in engineering machinery, metallurgical machinery, plastic machinery, lifting and closing machinery, mining machinery, road construction machinery, textile machinery, glass machinery and other industries. The products are sold at home and abroad.

1. Description: Honed tube is a kind of smooth bore steel tube used to manufacture hydraulic cylinder barrels that is the core part of a piece of hydraulic cylinder. 

2. Commodity: SAE1026 cold drawn seamless honed tube

3. Size range: 40mm*30mm-580mm*500mm

4. Available steel grade: 

SAE/AISI:	SAE1020, SAE1026, SAE1045, SAE4130, SAE4140
DIN:	ST52, ST52.3, ST52.4
EN:	E355, C45E, 25CrMo4, 42CrMo4, CK45, S45C, E410, E470
GB:	20#, 45#, 16Mn, Q345B, Q345C, Q345D, Q345E, 25Mn, 27SiMn,

5. Manufacture method: Cold rolled, hydraulic cold drawn, hot rolled+deep hole boring

6. Delivery condition: 

BK	BKW	BKS	GBK	NBK	Q+T
+C	+LC	+SR	+A	+N
Cold rolled	Cold drawn	Stress relieved	Annealed	Normalized	Quenched+Tempered

7. Bore treatment: Honing, skiving&roller burnishing

8. Bore roughness control: Ra0.25um max or Ra0, 35um max for honed tubes, Ra0.25um max for skived&roller burnished tubes. 

9. End finish: Plain ends with square cuts, free of burrs for honed tubes. Little bevelled ends for skived&roller burnished tubes. 

10. Standard export packing: In bundles tied with steel strips. Int&ext oil coating. End plastic caps. External packing by PVC bags and knit bags. 

11. Customized packing and marking can be provided upon request. 

12. H8 tolerance: 

ID range	Tolerance	ID range	Tolerance
18< d ≤30	+0/+0.033	180< d ≤250	+0/+0.072
30< d ≤50	+0/+0.039	250< d ≤300	+0/+0.081
50< d ≤80	+0/+0.046	300< d ≤315	+0/+0.081
80< d ≤120	+0/+0.054	315< d ≤400	+0/+0.089
120< d ≤180	+0/+0.063	400< d ≤500	+0/+0.097

13. Difference between honed tube and skived&roller burnished tube: In hydraulic cylinder industry, there are 2 solutions for bore treatment: Honing, and skiving&roller burnishing. Honing or skiving&roller burnishing leads to different internal surface image, but both ensure good roughness. 

Standard Size:
I.D(mm)	O.D(mm)	WT(mm)	I.D(mm)	O.D(mm)	WT(mm)	I.D(mm)	O.D(mm)	WT(mm)
40	50	5	90	100	5	140	156	8
40	52	6	90	105	7.5	140	160	10
40	55	7.5	90	110	10	140	165	12.5
40	58	9	90	114	12	140	168	14
50	60	5	95	105	5	140	170	10
50	65	7.5	95	110	7.5	140	180	20
50	70	10	100	110	5	150	170	10
60	70	5	100	115	7.5	150	175	12.5
60	72	6	100	120	10	150	180	15
60	75	7.5	100	125	12.5	160	180	10
60	80	10	100	127	13.5	160	185	12.5
63	73	5	100	130	15	160	190	10
63	75	6	110	125	7.5	160	200	20
63	76	6.5	110	130	10	170	190	10
63	78	7.5	110	140	15	170	195	12.5
63	80	8.5	115	130	7.5	170	200	15
63	83	10	115	135	10	180	200	10
70	80	5	120	135	7.5	180	205	12.5
70	82	6	120	140	10	180	210	15
70	85	7.5	120	145	12.5	180	220	20
70	90	10	120	150	15	200	220	10
75	85	5	125	140	7.5	200	225	12.5
75	90	7.5	125	145	12.5	200	230	15
75	95	10	125	150	12.5	200	235	17.5
80	90	5	125	152	13.5	200	245	22.5
80	92	6	125	155	15	220	250	15
80	95	7.5	125	160	17.5	220	270	25
80	100	10	130	145	7.5	220	273	26.5
80	102	11	130	150	10	240	270	15
80	105	12.5	130	160	15	250	290	20
80	110	15	135	160	12.5	250	299	24.5
Special requirement						230.5	254	11.75

Mechanical Property:
Delivery  condition		cold finished(hard)(BK)				Cold drawn and stress-relieved(BK+S)
Steel grade		Rm MPa			Elongation A5(%)	Rm MPa	ReH MPa	Elonggation A5(%)
20#		≥550			≥8	≥520	≥375	≥15
16Mn		≥640			≥5	≥600	≥520	≥14
ST52(E355)		≥640			≥5	≥600	≥520	≥14
SAE1026		≥640			≥5	≥600	≥510	≥12
45#		≥650			≥5	≥600	≥510	≥12

Chemical Composition:
Steel grade		Chemical composition,%
		C		Si	Mn	P	S	Cr
						≤
20#		0.17-0.24		0.17-0.37	0.35-0.65	0.035	0.035	0.25
16Mn		≤0.2		≤0.5	1.00-1.60	0.03	0/03	0.25
ST52(E355)		≤0.22		≤0.55	≤1.6	0.025	0.025	0.25
SAE1026(25Mn)		0.22-0.28		0.15-0.35	0.6-0.9	0.04	0.05	/
45#		0.42-0.5		0.17-0.37	0.5-0.8	0.025	0.02	0.25

PM/SCHWING /ZOOMLION Pump Cylinder 

Putzmeister
Outer Diameter(mm)	Inner Diameter(mm)	length(mm)	Travel(mm)
305	280	2355	2200
278	250	2710	2500
278	250	2310	2100
254	230	2320	2100
254	230	1600	1400
219	200	2305	2100
219	200	1585	1400
203	180	2305	2100
Schwing
Outer Diameter(mm)	Inner Diameter(mm)	length(mm)	Travel(mm)
270	250	2635	2500
270	250	2135	2000
251	230	2125	2000
251	230	2133	2000
253	230	1175	1000
219	200	2125	2000
219	200	1775	1600
210	180	2125	2000
203	180	2125	2000
202	180	1775	1600
200	180	1520	1400
196	180	1320	1200
200	180	1175	1000
Outer Diameter(mm)	Inner Diameter(mm)	length(mm)	Travel(mm)
280	260	2345	2200
280	260	2245	2100
280	260	2145	2000
280	260	2045	1900
258	230	2146	2000
258	230	1946	1800
258	230	1746	1600
226	200	1946	1800
226	200	1746	1600
226	200	1546	1400
Zoomlion
Outer Diameter(mm)	Inner Diameter(mm)	length(mm)	Travel(mm)
280	260	2250	2100
250	230	2250	2100
258	230	1800	1600
219	200	1960	1800
219	200	1800	1600
219	200	1587	1400

Products shows





Production Process:


Packing and Shipping:

Company information:

 

Tiajin Boerking Steel Pipe Co., Ltd is one of companies specializing in producing and exporting

steel pipes and pipe fittings in China.

Our main products are API 5L GR.B,X42,X52,X60,X70,X80 PSL1/PSL2 Seamless Pipe, ASTM A106/SA106 Seamless Pipe, ASTM A53 Seamless Pipe, A335/SA179/SA192/A333 Seamless Pipe, and AISI1020 AISI1045 Seamless Pipe and API 5CT oil and casing steel pipes.

Our company's featured products are customized diameter steel pipe(such as 318mm,216mm,

 254mm...),cold drawn steel pipe made to order, hot expanding steel pipe, 609.6mm~1020mm

 SEAMLESS steel pipe, hollow section with customized size.

 The annual yearly output is about 30,000 tons which is exported to all over the world, such as Korea, Malaysia, Singapore, Vietnam, Philippines, Thailand, Myanmar,HongKong, Taiwan, India, Pakistan, Bangladesh, Iran, Egypt, Australia, United Kingdom, Serbia, Guatemala, Argentina and so on. Tianjin Boerking Steel Pipe Co., Ltd believes in honesty,mutual respect and development, consistantly high quality and we continue to seek improvements by listening to our clients and giving due attention to their specifications and suggestions. Looking forward to your enquiry!

 

 

FAQ

Q: What about your payment term?

A: Usually T/T or L/C, 30% deposit and 70% before delivery.

Q: what about your standard delivery date

A: 15~25 days after receiving deposit 

Q: How about your capacity?

A: For steel pipes, 60,000 tons per month, 720,000 tons per year.  For pipe fittings, 30,000 tons per year

Q: what about your package

A: Usually as per customer's requests.

Common packing information: Small size in bundles, big size in bulk, some sizes with plastic cap to protect both ends, seaworthy packaging. 

Q: What is your main market &main customers

A: We have 15years experience on steel pipes & pipe fittings.  Our main market includes China, Singapore etc.  Main Customers including HYST, Keppel group etc.

Q: If products have some quality problem,how would you deal with?

A: We will responsible for all of our quality problems.

Q: How to get accurate price / quotation from you?

A: Please kindly tell us below details and we'll send our quotation to you ASAP:

1) Pipe's outer diameter             2) Wall thickness                            3) Section Shape (round, square etc.)

4) length for each pipe               5) steel grade                                  6) Standard (e.g.: API 5L)

7) order quantity                          8) Designation (BK, BKW etc.)     9) Trade Terms

P.S.: more detailed information you clarified, more exact price we provided.

Contact:

If you have any question, please feel free to contact me by the email or telephone!