Honed Tube----Cold Drawn Cylinder Tubes and Hard Chrome Bars

Honed Tube----Cold Drawn Cylinder Tubes and Hard Chrome Bars

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Cold Drawn Cylinder Tubes Suitable To Hone (HPZ)

Specification:EN 10305 part 1/2 (former DIN 2391/3) 

Grade:E355 (St 52), other materials upon request 

Delivery condition:+ SR (BK+S) cold drawn and stress-relieved

Finish: Random lengths Cut lengths 

Outside diameter:30 to 200 mm 

Wall thickness:5 to 20 mm 

Certification:3.1 according to EN 10204, others upon request

Cold Drawn and Hot Finished Cylinder Tube with Honed or Skived- Roller Burnished Bore (HP)

Specification: Cold Drawn EN 10305-1/2 (former DIN 2391/3) 

Hot Finished EN 10297-1 or EN 10210 -1 

Grade: E355 or S355 (St 52), other materials on request 

Delivery condition: Cold drawn stress-relieved (BK+S). 

Hot finished as rolled (AR) or normalised (+ N )

Finish: Random lengths  Cut lengths

Ends: Capped

Tolerances ID: H8, ISO 286 Part 2 for cold finished, 

H8-H11, ISO 286 Part 2 for hot finished

Outside diameter: 25 to 280 mm for cold finished 

25 to 660 mm for hot finished 

Inner diameter: 20 to 600 mm 

Interior finish: Roller burnished or honed 

Surface Finish Ra max. 0.25 μm for cold finished 

Ra max. 0.5 μm for hot finished 

Certification: 3.1 according to EN 10204, others upon request

Seamless Cold Precision Steel Tubes for Piston Tube Applications (HPK) 

Delivery Terms: EN 10305-1 (former DIN 2391-2) 

Material: E355 (St 52), other materials on request 

Delivery Status:  C + (BK) cold drawn hard + SR (BK+S) cold drawn and stress-annealed 

+ N (NBK) normalised

Finish: Random lengths Cut lengths 

OD tolerances: TBA

ID Tolerances: TBA

Outside diameter: 35 to 140 mm 

Wall thickness: 3.5 to 15 mm 

Certification: 3.1 according to EN 10204, others upon request

Hard Chrome Piston Tubes (HPK) 

Specification: EN 10305-1 (former DIN 2391-2) 

Grade: E355 (St 52), other materials on request 

Delivery Condition:´ 

C + (BK) cold drawn hard 

+ SR (BKS) cold drawn and stress-annealed 

+ N (NBK) annealed normal 

Finish: Random lengths  Cut lengths

Tolerances OD: f7 -ISO 286 Part 2 

Outside diameter: 35 to 140 mm 

Wall thickness: 3.5 to 15.0 mm 

Surface: hard chrome 

Chrome layer thickness: 20 μm minimum 

Roughness: Ra max. 0.2 μm

 Micro hardness of chromium: min. 850 HV 0,1 min. 72 h NSS R 10

Test conditions: ISO 9227 

Evaluation: ISO 10289 

Certification 3.1 according to EN 10204, others on request

Hard Chrome Bars for Piston Rod Applications 

Grades: 20MnV6, Ck45 (C45E) AISI 329 Stainless AISI 630 Stainless Further materials upon request 

Finish: Random lengths  Cut lengths 

Tolerances OD: 8 to 16 mm -ISO f8; 18 to 160 mm = ISO f7

Surface: Hard chrome OD / 8 to 18 mm, 14 μm min

Chrome thickness: 20 to 160 mm 20 μm min

Roughness: Ra max. 0.2 μm

Micro hardness of chromium: min. 850 HV 0,1 

Corrosion resistance min. 72 h NSS rating 10. 

Min 216 hours NSS rating 9

OD 18 to 120 mm 

Certification:  3.1 according to EN 10204, others upon request

Typical Applications: 

Hydraulic and pneumatic cylinders for mining, agricultural and farm machinery, hoists, automotive and transport lifting equipment, waste disposal transport, food processing equipment, mechanical tools and equipment, compressors and earth moving equipment etc. 

Stainless Steel----Main stainless steel tube produce standard Specifications

Stainless Steel----Main stainless steel tube produce standard Specifications

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ASTM A213/A213M 

Seamless ferritic and austenitic alloy-steel boiler, superheater, and heat-exchanger tubes

ASTM A269/A269M 

Seamless and welded austenitic stainless steel tubing for general service

ASTM A358/A358M 

Electric-fusion-welded austenitic chromium-nickel stainless steel pipe for high-temperature service and general applications

ASTM A409/A409M 

Welded large diameter austenitic steel pipe for corrosive or high-temperature service

ASTM A790/A790M 

Seamless and welded ferritic/austenitic stainless steel pipe

ASTM B167 

Nickel-chromium-iron alloys and nickel-chromium-cobalt-molybdenum alloy seamless pipe and tube

ASTM B407 

Nickel-iron-chromium alloy seamless pipe and tube

ASTM B444 

Nickel-chromium-molybdenum-columbium alloys (UNS N06625) and nickel-chromium-molybdenum-silicon alloy (UNS N06219) pipe and tube

ASTM B668 

UNS N08028 seamless tubes

ASTM B829 

General requirements for nickel and nickel alloys seamless pipe and tube

ASTM A213/A213M 

Seamless ferritic and austenitic alloy-steel boiler, superheater, and heat-exchanger tubes

EN 10217-7 

Welded steel tubes for pressure purposes-Technical delivery conditions-Part 7: Stainless steel tubes

ASTM A249/A249M 

Welded austenitic steel boiler, superheater, heat-exchanger, and condenser tubes

ASTM A312/A312M 

Seamless and welded, and heavily cold worked austenitic stainless steel pipes

ASTM A376/A376M 

Seamless austenitic steel pipe for high-temperature central-station service

ASTM A511 

Seamless stainless steel mechanical tubing

ASTM A789/A789M 

Seamless and welded ferritic/austenitic stainless steel tubing for general service

ASTM A928/A928M 

Ferritic/austenitic (Duplex) stainless steel pipe electric fusion welded with addition of filler metal

ASTM B165 

Nickel-copper alloy (UNS N04400) seamless pipe and tube

ASTM B338 

Seamless and welded titanium and titanium alloy tubes for condensers and heat exchangers

ASTM B423 

Nickel-iron-chromium-molybdenum-copper alloy Seamless pipe and tube

ASTM B622 

Seamless ferritic and austenitic alloy-steel boiler, superheater, and heat-exchanger tubes

ASTM B677 

UNS N08904, UNS 08925, and UNS N08926 seamless pipe and tube

EN 10216-5 

Seamless steel tubes for pressure purposes-Technical delivery conditions-Part 5: Stainless steel tubes

ASTM B407 

Nickel-iron-chromium alloy seamless pipe and tube

ASTM, ISO, DIN, NF, JIS AND GOST specifications are available.

Hydraulic Tube---- DIN Series Precision Steel Tube

Hydraulic Tube---- DIN Series Precision Steel Tube

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Cold Drawing Series of BA Tube

DIN Cold Drawing and BA Seamless Tube with High Precision

Synopsis of Process Routing：Quality carbon steel、cold drawing 、 bright heat treatment without oxidization (NBK status) 、 nondestructive testing、 in the wall honing and inside flushing under the high pressure、 antirust oiling outside surface、 plastic capping on both ends.

Main Features：high accuracy, excellent brightness, no oxidization on the outer and inner walls after heat treatment, high cleanness inside wall. The steel tube is able to stand high pressure. No deformation after cold bending, no crack after flaring and flattening . The complicated geometrical forming and machining can be realized. Color of tube: gray with white.

Main Application：to be used in hydraulic system, automobile and in the occasion where the high precision, brightness, cleanness and mechanical properties of the tube are required.

DIN Black and Phosphated Hydraulic Tube with High Precision

Synopsis of Process Routing：DIN highly accurate, cold drawn and bright seamless steel tube is used as the tube to be phosphated. The phosphated is realized with the imported chemical fluid to form a black film. The antirust oil is absorbed by means of the micropore on the film to prevent from the rust. The caps are covered at two ends of tube to prevent from the dust.

Main Features：bright black. Color is homogeneously distributed on the tube surface. The tube has good property of antirust.

Main Application：used in hydraulic system. This tube is our main product for export business.

DIN Galvanized Steel Tube with High Precision

Synopsis of Process Routing：DIN highly accurate, cold drawn and bright seamless steel tube is used as the tube to be galvanized. The outer wall of tube is electroplated. The caps are covered at two ends of tube to prevent from the dust.

Main Features：white galvanized, color galvanized (yellow galvanized). The outer wall of tube has good property for antirust and anticorrosion. Note: Length for galvanized steel tube should be within 6 Meters.

Main Application：used in hydraulic system, in the occasion where the requirement for antirust and anticorrosion of outer wall is relatively high.

DIN Internally and Externally Galvanized Steel Tube with High Precision

Synopsis of Process Routing：DIN highly accurate, cold drawn and bright seamless steel tube is used as the tube to be internally and externally galvanized. The inner and outer wall of tube are electroplated, and/or passivated with military green after galvanizing. The caps are used to cover two ends of tube to prevent from the dust.

Main Features：the inner and outer walls of tube are galvanized and/or passivated which have remarkable properties of antirust and anticorrosion. White galvanized, color galvanized (yellow galvanized) and passivation with military green can be realized. Note: the length of tube is not exceeded 3m. Main Features of passivation: High anti-corrosive performance, Salt spray testing as per GB/T10125,Testing times for 240 hours without rusting. 

Main Application：used in military industry, automotive and locomotive industries and in the case where the high antirust and anticorrosion for inner and outer tube walls are required.

Cold Rolling Series of BA Tube

DIN Cold Rolled and BA Seamless Steel Tube with High Precision

Synopsis of Process Routing：Quality carbon steel 、cold rolling 、bright heat treatment without oxidization (NBK status) 、nondestructive testing、in the wall honing and inside flushing under the high pressure、 antirust oiling outside surface、 plastic capping on both ends.

Main Features：inner and outer walls of tube have high accuracy, excellent brightness, no oxidization after heat treatment, and high cleanness inside tube. The steel tube is able to stand high pressure. No deformation after cold bending, no crack after flaring and flattening. The complicated geometrical forming and machining can be realized. Color of tube: bright white, with high metallic luster.

Main Application：used in automotive industry, and in the occasion where the high accuracy, brightness, cleanness of the tube are required.

DIN Cold Rolled and Galvanized Steel Tube with High Precision

Synopsis of Process Routing：DIN highly accurate, cold rolled and bright seamless steel tube is used as the tube to be galvanized. The outer wall of tube is electroplating. The caps are covered at two ends of tube to prevent from the dust.

Main Features：white galvanized, color galvanized (yellow galvanized). The high brightness of tube surface is obtained after galvanizing. A good property of antirust and anticorrosion on outer wall of tube is reached.

Main Application：used in automotive industry, and in the occasion where the high accuracy, brightness and anticorrosion property of the tube are required.

DIN Cold Rolled and Internally, Externally Galvanized Steel Tube with High Precision

Synopsis of Process Routing：DIN highly accurate, cold rolled and bright seamless steel tube is used as the tube to be galvanized. The inner and outer walls of tube are electroplated, and/or passivated with military green after galvanizing. The caps are used to cover two ends of tube to prevent from the dust.

Main Features：white galvanized, color galvanized (yellow galvanized) and passivation with military green. The high brightness on the surfaces of inner and outer walls is obtained after galvanizing. A good property of antirust and anticorrosion on inner and outer walls of tube are achieved.

Main Application：High anti-corrosive performance, Salt spray testing as per GB/T10125, Testing times for 240 hours without rusting.

Seamless Hydraulic Tube----Vary Standard Presentation

Seamless Hydraulic Tube----Vary Standard Presentation

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I: DIN Standard series

  Standard Name

1、    DIN 17175-1979 Heat-resisting seamless steel tube, technical delivery conditions

2、   DIN 17176-1990 Round seamless steel tube used for compressed hydrogen, technical delivery conditions

3、   DIN 17179-1986 Fine grained structural seamless steel with special requirements, technical delivery conditions

4、   DIN 17204-1990 Quenching and tempering treatment of seamless steel tube, technical delivery conditions

5、   DIN 17456-1999 Stainless steel tube with general requirements, technical delivery conditions

6、   DIN 2391-1-1994 Seamless precision steel tube Section 1: size

7、   DIN 2391-2-1994 Seamless precision steel tube Section 2: technical delivery conditions

8、   DIN 2393-1-1994 Precision welded steel tube with special dimensional precision

9、   DIN 2393-2-1994 Precision welded steel tube with special dimensional precision Technical delivery conditions

10、 DIN 2394-1-1994 Precision welded steel tube Size

11、 DIN 2394-2-1994 Precision welded steel tube Technical delivery conditions

12、 DIN 2395-1-1994 Precision welded steel tube with rectangular or square section Size

13、 DIN 2395-2-1994 Precision welded steel tube with rectangular or square section Technical delivery conditions

14、 DIN 2395-3-1981 Precision electric welded steel tube with rectangular or square section Technical delivery conditions of the steel tubes used for automobile manufacturing

15、 DIN 2413-2-1993 Calculation of internal pressure resisting wall thickness of steel tube

16、 DIN 2445 Bbi-2000 Seamless steel tube subjected to dynamic loading, calculation principles of straight Tube

17、 DIN 2448-1981 Size, unit, length and quality of seamless steel tube

18、 DIN 2470-1-1987 Steel gas tube with the allowable work pressure of below 16bar, requirements on the parts of tube

19、 DIN 2470-2-1987 Steel gas tube with the allowable work pressure of over 16bar, requirements on the parts of tube

20、 DIN 2916-1975 Bending radius and design drawings of seamless and welded steel tube

21、 DIN 2917-1982 Seamless steel tube used for heat steam tube and reservoir

22、 DIN 43614-2-1980 Requirements on the tubes used for electric switch device and compressed air tube and stainless tube

23、 DIN 50192-1977 De-carbonization layer depth measuring

24、 DIN 73000-1986 Jet tube used for the oil jetting device of internal combustion engine

25、 DIN 86009-1986 Exhaust pipe and steel tube used for ship

26、 DIN 86288-1989 Tubes used for ship and buildings on ship, steel tube with seat, shaped tube and shaped component used for ship manufacturing

27、 DIN EN 10216-5-1999 Technical delivery conditions of seamless steel tube used for pressure purpose

28、 DIN EN 10240-1998 Specifications for internal and external protection coatings of steel tube and heat zinc coating applied to automation factory

29、 DIN EN 10246-7-1996 Nondestructive testing of steel tube Section 7: Automatic ultrasonic test on the seamless steel tube

30、 DIN EN 10256-2000 Nondestructive testing of steel tube: qualification and ability of level-1 and level-2 nondestructive testing persons

31、 DIN EN 10297-1-2003 Seamless steel tube used for machinery and common use Technical delivery conditions Section 1: Un-alloy and alloy steel

32、 DIN EN 10305-1-2003 Seamless precision steel tube Technical delivery conditions Section 1: Cold-drawn seamless steel tube

33、 DIN EN 10305-2-1998 Technical delivery conditions of precision steel tube Section 2: Cold-drawn welded steel tube

34、 DIN EN 10305-3-1998 Technical delivery conditions of precision steel tube Section 3: Cold-rolled welded sizing steel tube

35、 DIN EN 10305-4-1998 Technical delivery conditions of precision steel tube Section 4: Cold-drawn welded steel tube used for hydraulic and pneumatic system

36、 DIN EN 10305-5-2000 Technical delivery conditions of precision steel tube Section 5: Welded and cold-shaped rectangular or square tube

37、 DIN EN 4235-4-1994 Technical delivery conditions of avigation and steel products Section 4: Steel tube

38、 DIN ISO 8535-1-1995 Steel tube used for compression ignition engine and high-pressure jet fuel tube Section 1: Technical requirements on cold-drawn single-wall steel tube

II: GB Standard series

  Standard Name

1、   GB/T17395-1998 Size, appearance, weight and allowable deviation of seamless steel tube

2、   GB/T8162-1999 Seamless steel tube used for structure

3、   GB/T14975-2002 Stainless seamless steel tube used for structure

4、   GB/T8163-1999 Seamless steel tube used for fluid transportation

5、   GB/T14976-2002 Stainless seamless steel tube used for fluid transportation

6、   GB/T3090-2000 Stainless small-diameter steel tube

7、   GB/T3089-1982 Stainless acid-resisting thin-wall seamless steel tube

8、   GB/T3639-2000 Cold-drawn or cold-rolled precision seamless steel tube

9、   GB/T3094-2000 Cold-drawn seamless shaped steel tube

10、 YB/T5035-1993 Seamless steel tube used for half-shaft casing for automobile

11、 GB/T5312-1999 Cold-drawn carbon steel and carbon-manganese steel seamless tube used for ship

12、 GB/T3093-2002 High pressure seamless steel tube used for diesel engine

13、 GB/T8713-1988 Precise internal diameter seamless steel tube used for hydraulic and pneumatic cylinder

14、 GB3087-1999 Seamless steel tube used for low and medium pressure boiler

15、 GB5310-1995 Seamless steel tube used for high pressure boiler

16、 GB13296-1991 Stainless seamless steel tube used for boiler and heat exchanger

17、 GB6479-2002 High pressure seamless steel tubes used for fertilizer facility

18、 GB9948-1988 Seamless steel tubes used for petroleum cracking

19、  YB/T5052-1993 Seamless steel tube used for drilling diamond core

20、 GB/T17396-1998 Hot-rolled seamless steel tube used for hydraulic pillar

III: Foreign advanced standard series

        Standard Name

1、   JIS G 3445-1988 Carbon-steel steel tube used for mechanical structure

2、   JIS G 3454-1988 Carbon-steel steel tube used for pressure tubing

3、   ASTM A556/A556M-90a Cold-drawn carbon-steel seamless steel tube used for water supply heater

4、   ASTM A106-1991 Carbon-steel seamless steel tube used for high-temperature operation

5、   ASTM A179/A179M-1990a（2001） Specifications of cold-drawn low-carbon seamless steel tube used for heat exchanger and condenser

6、   NF A49-210-1985 Size and technical delivery conditions of cold-drawn seamless steel tube used for liquid transportation

7、   BS EN 10216-1-2002 Seamless steel tube Technical delivery conditions Section 1: Un-alloy steel tube under specified ambient temperature