High-pressure tubes

Seamless high-pressure tubes for a variety of high-pressure applications using liquid or gas as the pressure medium, such as hydraulic installations, test benches and water-jet cutting equipment.

Sandvik high-pressure tubes are characterized by high yield strength and high tensile strength in connection with high elongation. The pressure resistance is guaranteed by the very smooth inside surface. An autofrettage treatment prolongs the cycle fatigue behavior.

Materials and properties

Sandvik gradeUNSASTMEN steel no.W.Nr.AFNOR
Sandvik 5R10 S30400 304 1.4301 1.4301 Z2CND18-09
Sandvik 3R65 S31603/S31600 316L/316 1.4404/1.4401 1.4404 Z2CND17-12
Sandvik SAF 2507 S32750
-
1.4410
-
-
Sandvik HP160*
-
-
-
-
-
Sandvik 254 SMO S31254 - - - Z1CNDU20-18-06AZ

* Contact us for more information

Mechanical properties
Sandvik gradeYield strength
Rp0,2 min. MPa
Tensile strength
Rm min. MPa
Elongation A
%, min
Sandvik 5R10 1) 600 700 18
Sandvik 3R65 1) 600 700 18
Sandvik SAF 2507 2) 550 800-1,000 25
Sandvik HP160* 2) 450 850 35
Sandvik 254 SMO 2)  340 650 65 

1) Hard condition.
2) Annealed condition. Tubes with higher values can be offered on request.
* Contact us for more information

Sizes and surfaces

Sizes and working pressure

Sandvik high-pressure tubes are manufactured in standard sizes according to the table. Standard lengths are 4-7 meters. Other sizes and lengths up to 16 meters can be offered on request.

OD = Outside diameter
ID = Inside diameter
WT = Wall thickness
OD
mm
OD
in.
ID
mm
ID
in.
WT
mm
WT
in.
Working pressure
(stat.)1) bar
Sandvik 3R65/5R10
Working pressure
(stat.) bar
Sandvik HP160
Weight
kg/m
6
-
2.2
-
1.90
3,120
5,710
0.195
6.35
1/4
2.39
3/32
1.98
0.0781
3,045
5,580
0.217
6.35
1/4
2.29
0.0902
2.03
0.0799
3,180
-
0.220
6.35
1/4
1.59
1/16
2.38
0.0938
4,300
7,890
0.237
9.52
3/8
3.20
1/8
3.16
0.1245
3,380
6,190
0.503
9.52
3/8
1.60
1/16
3.96
0.1560
5,530
10,140
0.551
14.00
-
8.00
-
3.00
-
2,330
-
0.826
14.00
-
5.00
-
4.50
-
3,200
-
1.070
14.30
9/16
8.00
5/16
3.15
0.1240
2,380
4,360
0.879
14.30
9/16
4.76
3/16
4.77
0.1878
3,390
6,210
1.138
19.05
3/4
1.80
-
8.63
-
-
12,00
2.251
30.00
-
10
-
10
-
-
6,250
5.008

1) Calculation basis:
K: Factor = OD/ID
K < 2: Calculation according to AD-regulation B10
K > 2: Calculation basis full plastic condition. Safety factor 0.45.

Tolerances

OD and ID: +/- 0.1 mm
WT: +/- 10%
Other tolerances can be offered on request.

Surfaces

As a standard, the internal surface is free from laps, flaws and fissures deeper than 0.1 mm, max. 5 defects > 0.05 mm per cross-section. On prior consultation, depth of defects of max. 0.02 mm according to DIN ISO 8535-1 can be reached.

Testing

Testing of high-pressure tubes includes:

  • Examination of dimensions
  • Technological tests
  • Tensile testing
  • Metallographic examination
  • Intergranular corrosion test
  • Eddy Current test

Tests made on request are, for example:

  • Hydrostatic test
  • Fatigue strength up to 4,000 bar
  • Maximum internal pressure up to 15,000 bar
  • Bursting pressure trials

The tests carried out are certified according to DIN EN 10204 3.1. Reception tests according to DIN EN 10204 3.2 by neutral experts can be made on request.

Examinations to determine the cycle fatigue behavior under defined operating conditions can be carried out on request. We offer individual advice.

Our testing laboratory for high-pressure tubes is accredited according to ISO 17025.

Inspection

The scope of inspection depends on the customer specification.