DIN2391 Cold Drawn Precision Seamless Steel Pipes

Precision Steel Pipes for Hydraulic system 
OD:4-80 (mm) WT0.5-10 (mm) Length 12000mm

1. Standard:  
DIN2391 Precision Seamless Steel tubes for precision hydraulic systems

DIN2393 Precision Welded Steel tubes for precision hydraulic systems

2. Steel Grade: St 30SI, St 30 Al, St35,St45, St52, other materials upon agreement with customers.

3. Production method: Cold drawn on the seamless steel tubes, to reach high accuracy on the OD and WT tolerance

4.Size range: 
O.D.:20-350mm     W.T.:1-15mm      L:max12000mm

5. Packing:
In Hexagonal Bundles, wth anti-rust oil protection, with seaworthy packing  
6.Deliver condition:

1). BK Cold finished (hard)
2). BKW Cold finished (soft)

3). BKS Cold finished and stress relieved

4). GBK Annealed
5). NBK Normalized

Seamless Carbon and Alloy Steel Mechanical Tubing ASTM A519

Seamless Carbon and Alloy Steel Mechanical Tubing ASTM A519

Size range: O.D.:6-350mm W.T.:1-50mm L:max12000mm

Standard: ASTM A519

Applications: for Machinery, Mechanical Engineer

Steel Grade and Chemical Compositions:
Steel	C	Mn	P	S	Si	Cr	Mo
Grade	max		max	max	max	min
1008	0.10	0.30-0.50	0.040	0.050
1010	0.08-0.13	0.30-0.60	0.040	0.050
1018	0.15-0.20	0.60-0.90	0.040	0.050
1020	0.18-0.23	0.30-0.60	0.040	0.050
1026	0.22-0.28	0.60-0.90	0.040	0.050
1035	0.32-0.38	0.60-0.90	0.040	0.050
1045	0.43-0.50	0.60-0.90	0.040	0.050
4130	0.28-0.33	0.40-0.60	0.040	0.040	0.15-0.35	0.80-1.10	0.15-0.25
4140	0.38-0.43	0.75-1.00	0.040	0.040	0.15-0.35	0.80-1.10	0.15-0.25

Grade	condition	Ultimat	Yield	Elongation	Rockwell
		Strength	Strength		Hardness
		ksi      Mpa	ksi      Mpa	%	B Scale
1020	HR	50        345	32        221	25	55
	CW	70        483	60        414	5	75
	SR	65        448	50        345	10	72
	A	48        331	28        193	30	50
	N	55        379	34        234	22	60
1025	HR	55        379	35        241	25	60
	CW	75        517	65        448	5	80
	SR	70        483	55        379	8	75
	A	53        365	30        207	25	57
	N	55        379	36        248	22	60
1035	HR	65        448	40        276	20	72
	CW	85        586	75        517	5	88
	SR	75        517	65        448	8	80
	A	60        414	33        228	25	67
	N	65       448	40        276	20	72
1045	HR	75        517	45        310	15	80
	CW	90        621	80        552	5	90
	SR	80        552	70        483	8	85
	A	65        448	35        241	20	72
	N	75       517	48        331	15	80
4130	HR	90         621	70        483	20	89
	SR	105        724	85        586	10	95
	A	75        517	55        379	30	81
	N	90        621	60       414	20	89
4140	HR	120        855	90        310	15	100
	SR	120        855	100        689	10	100
	A	80        552	60        414	25	85
	N	120       855	90        621	20	100

Deliver condition:

1. A.W.H.R.    "as welded" from hot-rolled steel

2. A.W.C.R.      "as welded" from cold-rolled steel

3. S.D.C.R.       "sink-drawn", cold-rolled steel

5. M.D.              mandrel drawn

6. S.S.I.D.          special smooth inside diameter

Please specify the delivery condition and heat treatment requirement when sending the inquiry.

Seamless precision tubes for hydraulic cylinders

Seamless precision tubes for hydraulic cylinders

Lets work with 4xP: PROMOTION of best PRODUCTS at the correct PRICE to client's PLACE.

4P MARKETING

Creativity is very important to find solutions for clients' problems. This means that a supplier of tubular products should be helpful in cooperation with the client to make the right choices as far steelgrades and size ranges are concerned. The supplier should also show creativity to ensure short delivery terms by finding the correct stock items. They should never give up to satisfy the client by promoting quality products, at the correct price  at the right place. We pretend to be such a supplier, correct, innovative and trustworthy. Lets start a nice cooperation to our mutual benefit. Lets work with 4xP:  PROMOTION of best PRODUCTS at the correct PRICE to client's PLACE.

Credibility

Credibility

Unfortunately we have to admit that there are cowboys operating in Chinese steel industry. They destroy the credibility of Chinese business people and their companies. These guys don't make true what they are promising. On the contrary they lie and cheat. Its very sad to admit and such guys should be persecuted by all means because they give China a bad name. Fortunately there are also many many good people and trustworthy companies who do their best to satisfy the customers. We do not say we are the best but we try to prove that our aim and target is to supply a good product and reasonable price and to give the best service. Again we will cherish the chances any clients who gave us and make every effort to do everything as perfect as possible.

Seamless Steel Skiving Tube for Hydraliuc & Pneumatic Cylinder

Description

Seamless Steel Skiving Tube for Hydraliuc & Pneumatic Cylinder

Best Quality of Skiving Tubes in Automatic Mechanical Engineering.

Seamless Steel Honed Tube: JIS STKM13C/ DIN ST52/ ASTM A106/ SAE1020 and Seamless Steel Welded Pipe: DIN ST52.3 are offered. Seamless Steel Honed Tube withstands higher pressure than welded tube without splits. But roundness of welded pipe is superior to Seamless Steel Honed Tube. After honing, carbon steel pipe of mechanical structure use has precision diameter, smooth surface and excellent performance in oil storage. It can stand longer and work smoothly without pausing. It also applies to hydraulic cylinders tube, pneumatic cylinders tube, forklift, crane, excavator, punching machine and other kinds of labor-saving automatic mechanical engineering.

Cold drawn Precision Tube

Product Name :

Cold drawn Precision Tube

Description :

As a leading manufacturer of Cold Drawn Pipe, we has been devoted in providing high quality Pipes. Cold Drawn Precision Steel Tube, featuring its durable quality and competitive price, is one of our best selling products. We also produce various other Stainless Steel Pipes and Stainless Tube.


Reliable Cold Drawn Pipe and Cold Drawn Precision Steel Tube Manufacturer

Material of Cold Drawn Precision Steel Tube: JIS STKM11A, 12A, 13A to 18C / DIN ST52 / ASTM A106. Cold Drawn Precision Steel Tube within precise interior diameter has great surface roughness and better than hot rolled tube. Specifications can be customized to achieve higher degree of tensile strength, yield strength and elongation. Cold Drawn Precision Steel Tube is suitable for gas cylinder, hydraulic cylinder, shock absorber of automobile, motorcycle and bicycle use. Besides, Cold Drawn tube can also be used in air-conditioning condenser, front fork and rear fork of motorcycle, mechanical arm and exhaust pipe.

Product Application :

Specification :

IDxOD m/m IDxOD m/m IDxOD m/m IDxOD m/m IDxOD m/m IDxOD m/m 20*25 40*45 63*68 75*90 100*107 125*137 20*30 40*50 63*71 80*86 100*109 125*140 25*30 45*55 63*73 80*89 100*110 130*142 25*35 50*55 63*76 80*92 100*114 140*153 30*36 50*57 65*75 80*95 100*115 150*160 30*40 50*60 70*80 85*100 110*120 160*172 35*41 55*65 70*85 90*100 120*132 180*196 35*45 60*70 75*85 90*105 125*134 180*202

* Other specifications can be ordered, please kindly contact with us!

Detail :

• Internal Diameter Accuracy : H8-H9
• Surface Roughness : Ra0.3-Ra0.6

Application :

Hydraulic cylinder Pneumatic cylinder Precise machine pipes Agriculture machine Boiler construction Machinery : Stamping machine Punching machine Blow molding machine Plastic injection machine Food machine Forklift

Automobiles: Crane Truck Truck lifter Shock absorber of car, motorcycle, bicycle Furniture: gas spring Exercise equipments Medical equipments Door closer Condensing unit Pipe

Loyalty means that we are looking for a long term relationship with our clients. Spotbusiness is not our target because we want a real connection based on mutual respect. Some suppliers say they consider their client being the king but they donot treat them as king. We donot say client is the king but a client is our partner. We like to work with our clients based upon partnership which means that we are aiming for mutual benefit respecting each other, keeping promises, encouraging each other with quality in products and services. We want to feel responsible for our clients. We want to show again and again our motivation and devotion to serve our clients. We want to prove that we donot give empty words but that we make true what we say. Believe us, give us the chance to confirm it.

Production site

Tubing Drawing  CUTTING

INSPECTION

PACKAGES 

• a) packed in plastic woven bags

• b)Packed In Wooden Cases
  
  c)  Packed In Cartons
• 
  
  

CONTACT: MS ALICE CHEN TEL:0086 22 26625616; FAX:0086 22 26631216; MOBILE:0086 15822528401; SKYPE:honghong6085; EMAIL:tianjinnorthgroup@gmail.com

Appearance of our factory & workshops

Appearance of factory

Appearance of workshops

Control of production procedure of our factory

Designed manufacturing procedure

①Inspection of raw material pipe: Chemical analysis,surface inspection,Tolerance of W.T:+/-8%, tolerance of OD:+/-0.75%。
②Inspection of pickling and lubrication
③Inspection after cold drawing: size&size tolerance,and internal&external surface.
④Tensile test: tensile strength,yield strength,elongation,hardness,flattening
⑤Inspection of straightness:horizontal straightness by device and vertical straightness by naked eyes.
⑥Polishing&inspection:external surface check.
⑦Second cold drawing:Size&size tolerance,internal&external surface.

Instructions about OD,ID,W.T,straightness of tubes:
1. Tolerance of OD will be as per standard specification,if there no specific requirement. ID tolerance as per customers’ requirements.
2. Ovality of ID: 0.15mm max.
3. Tolerance of W.T: +/-5%
4. Straightness: 0.5mm/1000mm max for tubes below 3m, 0.8mm/1000mm for tubes between 3m and 6m,1.2mm/1000mm for tubes between 6m and 9m

Our factory Quality control system

Certification system

Qualification certification:
We got ISO9001-2000 certification in 2004 and get the revision edition in 2007 and ISO9001-2008 in 2010 respectively.

Test&inspection system

In house inspection：

Through years’ of operation,continuous satisfaction of customers’ requirements,and cooperation with big customers,we have already established a feasible quality control system,covering inspection of raw material,inspections in different production stages,as

well as aftersales services.

1. Traceability of product: Inspection of raw material,Mill Test Certificate of raw material,management of stock ensure that we can track

each piece of tube we produce and ship.

2. Control of production procedure: There are inspections and inspection records in different manufacturing stages and this ensures that

each piece of problem tube is rejected in our workshop.

3. Control of finished tubes:A final overall inspection will be carried out to ensure the overall quality of tubes.Based on this, we will issue

our Mill Test Certificate to our customers.

Material test machine	Hardness tester	Ultrasonic thickness tester
		Roughness tester

Quality improvement

We are devoting ourselves to improving the oeverall quality of the tubes through introduction of human resources,improvement&input of equipment&device,proceduction procedure,and management.

We ensure stable quality through stablizing the sourcing channel of raw material and strict in house test&inspection system.

Based on stable quality, we adpoted hot phosphating procedure, use high quality alloy steel modules with regulated dialy maintenance, and better packing material to ensure that the tubes are of better internal&external surface quality,more strict size tolerance,better appearance,and under better proection&storage.

Third party inspection

As an important part of quality control system in our company,the inspection range covers general test items like chemical analysis,tensile test,hardness test,and special requirements like impact test,metallographic test,etc. We can accept any world famous third party inspection authorities like SGS,BV,Intertek Moody,etc. Customers can also authorize us to appoint third party inspection authorities and we ensure the qualification of these authorities who are all national certified professional labs in world famous enterprises

Trust and confidence

Trust and confidence is the most important issue in business. Many donot trust China because there is regular negative news about China. We like to make sure that for us this topic is essential. When customers donot have trust then we even donot want to start business. For us no trust, no business.we only promise what we can do, we never promise what we could not do, Business is a mutual activity and only mutual confidence can give optimal satisfaction. We want to prove confidence, make it true and sure. Please give us this chance and you wont be disappointed. Confidence can only be created by highest level of quality, best service possible, also after sales service reasonable fixed prices and reliable delivery times. Again, please give us a chance, we want to prove these things. Send us your specifications and you get a detailed quotation. Please try us out. We are available for you, now and in the future. For tubes, pipes, fittings according to international specifications and norms. We wait for you!!  Believe Ms Alice Chen, you will be never disappointed & you will always get a big surprise.



Contact: Ms Alice Chen 

Tel:0086 22 26625616;

Fax:0086 22 26631216;

Mobile: 008615822528401;

Skype: honghong6085

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