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Description:
​Hydraulic steel tubes are made of material E235 (ST 37.4) or E355 (ST 52.4) according to DIN EN 10305-4 (DIN 2445/2) or DIN EN 10305-1 (DIN 2391/C). The material is +N (NBK) annealed, phosphate and oiled internally and externally. The tube ends closed with plastic plugs with continuous marking along the entire tube length. The tubes are delivered with 3.1. certification on EN 10204.​
Size Range (Metric)
  • 6MM to 190MM
Size Range (Inch OD)
  • 1/8" to 4"
Dimension Standard
  • DIN EN 10305-1 (DIN 2391/C)
  • DIN EN 10305-4 (DIN 2445/2)
Material
  • E355 (ST52.4)​
  • E235 (ST37.4)
Finishing
  • NBK (Phosphate and Normalized)
Origin
  • China
Catalogue:
Hydraulics Steel Tubes
Vertical Divider
Literature:
Hydraulics Steel Tubes

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Product Information of Hydraulic Steel Tubes

1. Introduction:
​​
Chuan Kok maintains a large stock of hydraulic tubes in steel material. The hydraulic tube is a cylinder-shaped tubing device that connects to hydraulic systems, allowing fluids to flow between and inside components. They usually hold a length of about 6 meters. These steel tubes are in accordance with DIN 2391, the standard specification of steel tubes for precision application such as hydraulic and pneumatic power systems, and DIN 2445, the standard specification of seamless steel tubes for dynamic loads.
​
Steel tubes are available in two kinds of steel material, ST37.4 (E235N) and ST52.4 (E355N). Different materials result from differences in the working pressure that the material can withstand. Grade ST52.4 is a higher grade compared to grade ST37.4, and a higher grade of material quality can reduce wall thickness and weight while maintaining the same working pressure.

Hydraulic Steel Tubes in Difference Size
Hydraulic Steel Tubes in Difference Size
​2. Hydraulic Steel Pipe Attributes:

​Different material grades will lead to differences in attributes. For ST37.4, tensile strength ranges from 340 N/mm² to 480 N/mm², while for ST52.4, the tensile strength ranges from 490 N/mm² to 630 N/mm². Higher tensile strength means higher working pressures with reduced wall thickness, thus leading to reduced tube weight.
 
The two different steel grades also lead to different yield strengths. The minimum yield strength for ST37.4 is 235 MPa and for ST52.4 it is 355 MPa. However, for steel tubes with an outside diameter that is less than 30MM and a thickness that is less than 3.0MM, the minimum yield strength is 10 MPa lower.
 
There are also differences in chemical composition between ST37.4 and ST52.4. For example, the maximum carbon content for ST37.4 is 0.17%, while the maximum carbon content for ST52.4, is 0.22%. The high carbon content will make the steel harder and stronger through heat treatment. However, it will also cause the steel material to be less ductile and reduce the melting point. 
Chemical Composition (%)
Carbon (C)
Silicon (Si)
Manganese (Mn)
Phosphorus (P)
Sulfur (S)
​E355 (ST52.4)
​⩽ 0.22
⩽ 0.55
⩽ 1.6
⩽ 0.045
⩽ 0.045
E235 (ST37.4)
⩽ 0.17
⩽ 0.35
⩽ 1.2 ​
⩽ 0.045
⩽ 0.045

​3. Hydraulic Steel Tube Finishing:

The finishing of tubes under ST37.4 and ST52.4 are NBK, where tubes are normalized, phosphated, and oiled inside and outside. Normalizing is a type of heat treatment process. Heat treatment is done to change its mechanical properties such as hardness, yield strength, and ductility.
 
In the normalizing process, steel is heated to a temperature about 55˚C. This process will be continued over a period of time for a transformation namely grain refinement to occur. The steel then will be air-cooled in a room temperature. This results in the steel becoming stronger and harder. Besides, this cold drawn process brings advantages of tight dimensional tolerances, increased material strength, and improved machinability for the tube. Thus, hydraulic tubes are appropriate for use in high-performance pipe systems.

Galvanizing the tubes is also another technique. Zinc is added as an additional coating to the tubes to improve their anti-rust properties. Galvanizing can be done in a variety of ways, yet this hot-dip approach is the most popular and commonly used. The hot-dip galvanization process applies a thick layer of zinc to the melted tube before painting. Electro-galvanizing can be employed when a lighter form of zinc is needed on the tube's surface.
 
Hydraulic tubes can be produced in two ways: seamless or welded. As they are pulled from a billet, our hydraulic tubes are manufactured from a seamless method and do not have a weld-join or a seam.

4. Pressure Rating:

​At room temperature, allowable working pressures are determined using DIN 2413. The maximum permissible running pressure and required wall thickness are determined by the yield and tensile stress values. The actual yield and tensile stress values of the tubes and pipes are validated using true copy material certifications.
° C (in degree)
° F (in degree)
Rating Factor
40
-40
0.90
120
248
1.00
150
302
0.89
175
347
0.89
​200
392
0.83
​250
482
NA
​To calculate the allowed working pressure at increased temperatures, multiply the allowable working pressure of the tube outer diameter and thickness by the rating factor after determining the temperature measurement. ​​

5. Difference Between Hydraulic Tubes and Hydraulic Hoses:
Characteristics
Hydraulic Steel Tubes
Hydraulic Hose
Workability and Expansion
Ability to work and maintain shape
​under
 high heat.
Low-level of heat resistance. When the temperature is high, they have a tendency to expand.
​Cost
Less expensive and easily available for purchase
Expensive
Durability
Highly durable
Has a limited time for use

6. Installation:

Hydraulic tubes can be welded using standard welding processes. A bending radius of 3x the exterior tube outer diameter is suggested when cold bending tubes using an instrument tube bender or by hand.  Welding Filler should be chosen in line with DIN EN 1600 and DIN EN 12072 part 1, taking into consideration the welding skill sets and application type.

There are 4 steps for hydraulics steel tubes installation:

STEP 1: Cut the tube - You can use a wheel cutter or a mechanical cutter to cut the tube

STEP 2: Bend the tube - This is usually done using a hydraulic tube bender or by hand

STEP 3:​ Welding - There are three steps of welding: the weld bevel process, selecting the proper welding procedures, and inspecting your work after welding.

STEP 4: Installation - After both the hydraulic component and the associated equipment have been installed, this step is completed. After you've clarified the sequence and the pipe scheme, you may use a pipe clamp to minimize tube vibration while the flow passes through.

7. Outer Diameter and Tube Thickness Specifications:

The specifications of the tube outer diameter and tube wall thickness are according to EN 10305-4. Below Hydraulic Steel Tubes Literature will  shows the preferred outside diameter, inside diameter, and wall thickness.

​For more information regarding hydraulic steel tubes and their application, please refer to en.wikipedia.org/wiki/Hydraulic_machinery#Hose.2C_tubes_and_pipes

8. Hydraulic Tube (ST37.4 NBK) Working Pressure Table: 

 

No.

Description

Working Pressure (Bar)

Burst Pressure

(Bar)

IMPA CODE

1

4MM OD x 1.0MM THK x 6 MTR

707

1755

710701

2

5MM OD x 1.0MM THK x 6 MTR

565

1404

-

3

6MM OD x 1.0MM THK x 6 MTR

471

1170

710702

4

6MM OD x 1.5MM THK x 6 MTR

707

1755

710703

5

8MM OD x 1.0MM THK x 6 MTR

353

878

710704

6

8MM OD x 1.5MM THK x 6 MTR

530

1316

710705

7

8MM OD x 2.0MM THK x 6 MTR

707

1755

710706

8

8MM OD x 2.5MM THK x 6 MTR

883

2194

-

9

10MM OD x 1.0MM THK x 6 MTR

283

702

710707

10

10MM OD x 1.2MM THK x 6 MTR

339

845

710708

11

10MM OD x 1.5MM THK x 6 MTR

424

1053

710709

12

10MM OD x 2.0MM THK x 6 MTR

565

1404

710710

13

10MM OD x 2.5MM THK x 6 MTR

707

1755

-

14

12MM OD x 1.0MM THK x 6 MTR

236

585

710711

15

12MM OD x 1.2MM THK x 6 MTR

283

702

710712

16

12MM OD x 1.5MM THK x 6 MTR

353

878

710713

17

12MM OD x 2.0MM THK x 6 MTR

471

1170

710714

18

12MM OD x 2.5MM THK x 6 MTR

589

1463

-

19

12MM OD x 3.0MM THK x 6 MTR

707

1755

-

20

14MM OD x 1.5MM THK x 6 MTR

303

752

-

21

14MM OD x 2.0MM THK x 6 MTR

404

1003

-

22

14MM OD x 2.5MM THK x 6 MTR

505

1254

-

23

14MM OD x 3.0MM THK x 6 MTR

606

1504

-

24

14MM OD x 4.0MM THK x 6 MTR

807

2006

-

25

15MM OD x 1.0MM THK x 6 MTR

188

468

-

26

15MM OD x 1.2MM THK x 6 MTR

226

562

710715

27

15MM OD x 1.5MM THK x 6 MTR

283

702

710716

28

15MM OD x 2.0MM THK x 6 MTR

377

936

710717

29

15MM OD x 2.5MM THK x 6 MTR

471

1170

710718

30

15MM OD x 3.0MM THK x 6 MTR

565

1404

-

31

16MM OD x 1.5MM THK x 6 MTR

265

658

710719

32

16MM OD x 2.0MM THK x 6 MTR

353

878

710720

33

16MM OD x 3.0MM THK x 6 MTR

530

1316

-

34

18MM OD x 1.5MM THK x 6 MTR

236

585

710721

35

18MM OD x 2.0MM THK x 6 MTR

314

780

710722

36

18MM OD x 2.5MM THK x 6 MTR

393

975

710723

37

18MM OD x 3.0MM THK x 6 MTR

471

1170

-

38

20MM OD x 2.0MM THK x 6 MTR

283

702

710724

39

20MM OD x 2.5MM THK x 6 MTR

353

878

710725

40

20MM OD x 3.0MM THK x 6 MTR

424

1053

710726

41

20MM OD x 3.5MM THK x 6 MTR

495

1229

-

42

20MM OD x 4.0MM THK x 6 MTR

565

1404

-

 

 

No.

Description

Working Pressure (Bar)

Burst Pressure

(Bar)

IMPA CODE

43

20MM OD x 4.5MM THK x 6 MTR

636

1580

-

44

20MM OD x 5.0MM THK x 6 MTR

707

1755

-

45

22MM OD x 2.0MM THK x 6 MTR

257

638

710727

46

22MM OD x 2.5MM THK x 6 MTR

321

798

-

47

22MM OD x 3.0MM THK x 6 MTR

385

957

710728

48

22MM OD x 4.0MM THK x 6 MTR

514

1276

-

49

25MM OD x 2.0MM THK x 6 MTR

226

562

710729

50

25MM OD x 2.5MM THK x 6 MTR

283

702

710730

51

25MM OD x 3.0MM THK x 6 MTR

339

842

710731

52

25MM OD x 3.5MM THK x 6 MTR

396

983

-

53

25MM OD x 4.0MM THK x 6 MTR

452

1123

-

54

25MM OD x 5.0MM THK x 6 MTR

565

1404

-

55

28MM OD x 2.0MM THK x 6 MTR

202

501

-

56

28MM OD x 2.5MM THK x 6 MTR

252

627

710732

57

28MM OD x 3.0MM THK x 6 MTR

303

752

-

58

28MM OD x 4.0MM THK x 3 MTR

404

1003

-

59

28MM OD x 5.0MM THK x 6 MTR

505

1254

-

60

30MM OD x 2.0MM THK x 6 MTR

188

468

-

61

30MM OD x 2.5MM THK x 6 MTR

236

585

710733

62

30MM OD x 3.0MM THK x 6 MTR

283

702

-

63

30MM OD x 4.0MM THK x 6 MTR

377

936

-

64

30MM OD x 5.0MM THK x 6 MTR

471

1170

-

65

35MM OD x 2.0MM THK x 6 MTR

161

401

-

66

35MM OD x 2.5MM THK x 6 MTR

202

501

710734

67

35MM OD x 3.0MM THK x 6 MTR

242

602

-

68

35MM OD x 4.0MM THK x 6 MTR

323

802

710735

69

35MM OD x 5.0MM THK x 6 MTR

404

1003

-

70

38MM OD x 3.0MM THK x 6 MTR

223

554

-

71

38MM OD x 4.0MM THK x 6 MTR

297

739

-

72

38MM OD x 5.0MM THK x 6 MTR

372

924

-

73

42MM OD x 2.0MM THK x 6 MTR

135

334

-

74

42MM OD x 3.0MM THK x 6 MTR

202

501

-

75

42MM OD x 4.0MM THK x 6 MTR

269

669

710736

76

42MM OD x 5.0MM THK x 6 MTR

336

836

-

77

50MM OD x 3.0MM THK x 6 MTR

170

421

-

78

50MM OD x 5.0MM THK x 6 MTR

283

702

-

79

60MM OD x 3.0MM THK x 6 MTR

141

351

-

80

60MM OD x 5.0MM THK x 6 MTR

236

585

-

81

65MM OD x 6.0MM THK x 6 MTR

261

648

-

82

75MM OD x 3.0MM THK x 6 MTR

113

281

-

83

1/8"NB x 2.41MM THK x 6 MTR

649

1611

-

84

1/4"NB x 3.02MM THK x 6 MTR

618

1536

-

 

 

No.

Description

Working Pressure (Bar)

Burst Pressure

(Bar)

IMPA CODE

85

3/8"NB x 3.2MM THK x 6 MTR

523

1298

-

86

1/2"NB x 3.0MM THK x 6 MTR

391

971

-

87

3/4"NB x 3.0MM THK x 6 MTR

312

774

-

88

1"NB x 3.5MM THK x 6 MTR

291

723

-

89

1"NB x 4.55MM THK x 6 MTR

378

939

-

90

1 1/4"NB x 4.85MM THK x 6 MTR

321

797

-

91

1 1/2"NB x 5.08MM THK x 6 MTR

295

734

-

92

2 1/2"NB x 6.3MM THK x 6 MTR

NIL

580

-

93

1/4"OD x 1.2MM THK x 6 MTR

534

1327

-

94

1/4"OD x 1.5MM THK x 6 MTR

668

1658

-

95

3/8"OD x 1.22MM THK x 6 MTR

362

899

-

96

3/8"OD x 1.5MM THK x 6 MTR

445

1105

-

97

1/2"OD x 1.5MM THK x 6 MTR

334

829

-

98

3/4"OD x 2.0MM THK x 6 MTR

297

737

-

99

3/4"OD x 2.64MM THK x 6 MTR

392

973

-

100

1"OD x 3.0MM THK x 6 MTR

334

829

-

101

1 1/4"OD x 3.0MM THK x 6 MTR

267

663

-

102

1 1/4"OD x 3.25MM THK x 6 MTR

289

719

-

 

9. Hydraulic Tube (ST52.4 NBK) Working Pressure Table: 

No.

Description

Working Pressure (Bar)

Burst Pressure

(Bar)

IMPA CODE

103

10MM OD x 2.0MM THK x 6 MTR

799

1919

710710

104

12MM OD x 2.0MM THK x 6 MTR

666

1599

710714

105

14MM OD x 1.5MM THK x 6 MTR

428

1028

-

106

14MM OD x 2.0MM THK x 6 MTR

571

1371

-

107

15MM OD x 1.5MM THK x 6 MTR

400

959

710716

108

15MM OD x 2.0MM THK x 6 MTR

533

1279

710717

109

15MM OD x 2.5MM THK x 6 MTR

666

1599

710718

110

16MM OD x 1.5MM THK x 6 MTR

375

899

710719

111

16MM OD x 2.0MM THK x 6 MTR

500

1199

710720

112

16MM OD x 3.0MM THK x 6 MTR

749

1799

-

113

18MM OD x 1.5MM THK x 6 MTR

333

800

710721

114

18MM OD x 2.0MM THK x 6 MTR

444

1066

710722

115

20MM OD x 2.0MM THK x 6 MTR

400

959

710724

116

20MM OD x 2.5MM THK x 6 MTR

500

1199

710725

117

20MM OD x 3.0MM THK x 6 MTR

599

1439

710726

118

22MM OD x 2.0MM THK x 6 MTR

363

872

710727

119

25MM OD x 2.0MM THK x 6 MTR

320

768

710729

120

25MM OD x 2.5MM THK x 6 MTR

400

959

710730

121

25MM OD x 3.0MM THK x 6 MTR

480

1151

710731

122

25MM OD x 4.0MM THK x 6 MTR

639

1535

-

123

25MM OD x 5.0MM THK x 6 MTR

799

1919

-

124

28MM OD x 2.0MM THK x 6 MTR

285

685

-

125

28MM OD x 3.0MM THK x 6 MTR

428

1028

-

126

30MM OD x 2.0MM THK x 6 MTR

266

640

-

127

30MM OD x 3.0MM THK x 6 MTR

400

959

-

128

30MM OD x 4.0MM THK x 6 MTR

533

1279

-

129

35MM OD x 3.0MM THK x 6 MTR

343

822

-

130

35MM OD x 4.0MM THK x 6 MTR

457

1096

710735

131

38MM OD x 3.0MM THK x 6 MTR

315

757

-

132

38MM OD x 4.0MM THK x 6 MTR

421

1010

-

133

38MM OD x 5.0MM THK x 6 MTR

526

1262

-

134

42MM OD x 3.0MM THK x 6 MTR

285

685

-

135

42MM OD x 4.0MM THK x 6 MTR

381

914

710736

136

42MM OD x 5.0MM THK x 6 MTR

476

1142

-

137

45MM OD x 5.0MM THK x 6 MTR

444

1066

-

138

50MM OD x 5.0MM THK x 6 MTR

400

959

-

139

50MM OD x 6.0MM THK x 6 MTR

480

1151

-

140

50MM OD x 10.0MM THK x 6 MTR

799

1919

-

141

54MM OD x 6.0MM THK x 6 MTR

444

1066

-

142

60MM OD x 5.0MM THK x 6 MTR

333

800

-

143

60MM OD x 6.0MM THK x 6 MTR

400

959

-

 

No.

Description

Working Pressure (Bar)

Burst Pressure

(Bar)

IMPA CODE

144

65MM OD x 8.0MM THK x 6 MTR

492

1181

-

145

66MM OD x 8.5MM THK x 6 MTR

515

1236

-

146

76.1MM OD x 6.3MM THK x 6 MTR

331

794

-

147

80MM OD x 10.0MM THK x 6 MTR

500

1199

-

148

90MM OD x 5.0MM THK x 6 MTR

222

533

-

149

90MM OD x 10.0MM THK x 6 MTR

444

1066

-

150

97MM OD x 12.0MM THK x 6 MTR

494

1187

-

151

100MM OD x 10.0MM THK x 6 MTR

400

959

-

152

115MM OD x 15.0MM THK x 6 MTR

521

1251

-

153

120MM OD x 12.0MM THK x 6 MTR

400

959

-

154

130MM OD x 15.0MM THK x 6 MTR

461

1107

-

155

150MM OD x 15.0MM THK x 6 MTR

400

959

-

156

190MM OD x 20.0MM THK x 6 MTR

421

1010

-

157

2"OD x 5.9MM THK x 6 MTR

464

1114

-

158

2"OD x 6.0MM THK x 6 MTR

472

1133

-

 


Product Catalogue in pdf:
Hydraulic Steel Tubes Catalogue
Hydraulic Steel Tubes
Product Literature in pdf:
Hydraulic Steel Tubes Literature
Hydraulic Steel Tubes

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FAQ Of Hydraulic Steel Tubes

What are the diameter sizes available? What is the standard length for hydrailics steel
tubes?
​The sizes of hydraulics steel tubes range from 4mm to 130mm outer diameter. They typically have a length of 6 meter long.
What are the functions of hydraulics steel tubes?
The function of hydraulic steel tube is to convey liquid fluids to among hydraulics components, fittings, valves, flanges, and other tools. They are suitable in high performance piping system application.
What are the chemical composition for hydraulics steel tubes?​
​Hydraulics steel tubes consist of Carbon (C), Silicon (Si), Manganese (Mn), Phosphorus (P), Sulfur (S).
What are the material specifications of hydraulics steel tubes?
There are two types of material grade which are ST52.4 and ST37.4. Compared to ST37.4, ST52.4 has higher tensile strength and
higher permissible working pressures by reduced tube wall thickness. It leads to reduced system overall weight.
What is the finishing used by hydraulics tubes?
The hydraulics steel tubes surface finishing is NBK where the tubes are phosphate and normalized which is corrosion resistance.
Is hydraulics steel tubes suitable for welding?
Yes. Tubes of ST37.4 and ST52.4 are suitable for welding according to usual techniques.
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