Project Description

  • DOM Seamless Tubing

Commitment to You

We are committed to integrate steel resources in china and serve the global steel market. We have 15+ years of experience in steel researching, production, managing and sales.

Our ability to purchase materials directly from leading mills will give you the competitive edge. Any Questions Just Call +86-731-89903933

DOM Seamless Tubes

DOM Tubing (Drawn over Mandrel) is a cold drawn 1020 to 1026 or ST52.3 grade seamless steel tube to drawing to size. Cold drawing DOM to size allows for higher yield and tensile strengths. In comparison to other tubing, DOM is produced to more exact OD and ID tolerances. This allows for minimal machine time and has the highest strength possible.

DOM tubing

  • Stockedand produced various size range
  • Cut to length service available
  • Suitable to hone sizes
  • Custom sizes available upon request
  • All the common off road sizes available

Benefits of DOM Tubing (Drawn over Mandrel):

  • Uniform wall thickness with close OD and ID tolerances
  • Uniform grain structure and controlled hardness
  • High Yield and Tensile Strength
  • Smooth and Clean OD and ID surfaces
  • OD and ID concentric
  • Excellent machining characteristics

APPLICATIONS

  • Hydraulic Cylinders
  • Auto and Truck Axles
  • Suspension parts and shock absorbers
  • High Speed Shafts and rollers
  • Bearings and Spacers
  • Roll cages
  • Agricultural components and many other machined tubular parts.
  • Pre-honed tube

 

Quality Standards:

  • EN10305 Steel Tubes for Precision Applications Seamless Cold Drawn Tubes
  • DIN 2391 Seamless Precision Steel Tubes
  • ASTM A519 Seamless Carbon and Alloy Steel Mechanical Tubing

Composition & Strength

Grade Chemistry % Yield Tensile Elongation Typical Hardness
PSI PSI % in 2″ section Min
1020 Carbon 0.150 – 0.200 60000 70000 10 B-75
MN 0.300 – 0.600
P 0.035 Max
S 0.035 Max
1026 Carbon 0.220 – 0.280 70000 80000 10 B-80
MN 0.600 – 0.900
P 0.035 Max
S 0.035 Max
ST52.3 Carbon 0.140 – 0.180 75000 85000 15 B-80
Si 0.150 – 0.300
MN 1.200 – 1.400
P 0.020 max
S 0.010 max

Diameter Tolerances

OD Inches Wall: OD Inches ID Inches
Size Range Percent of OD Plus Minus Plus Minus
Up to 0.499 All 0.004 0
0.500-1.699 All 0.005 0 0 0.005
1.700-2.099 All 0.006 0 0 0.006
2.100-2.499 All 0.007 0 0 0.007
2.500-2.899 All 0.008 0 0 0.008
2.900-3.299 All 0.009 0 0 0.009
3.300-3.699 All 0.01 0 0 0.01
3.700-4.099 All 0.011 0 0 0.011
4.100-4.499 All 0.012 0 0 0.012
4.500-4.899 All 0.013 0 0 0.013
4.900-5.299 All 0.014 0 0 0.014
5.300-5.549 All 0.015 0 0 0.015
5.550-5.999 Under 6 0.01 0.01 0.01 0.01
6 and Over 0.009 0.009 0.009 0.009
6.000-6.499 Under 6 0.013 0.013 0.013 0.013
6 and Over 0.01 0.01 0.01 0.01
6.500-6.999 Under 6 0.015 0.015 0.015 0.015
6 and Over 0.012 0.012 0.012 0.012
7.000-7.499 Under 6 0.018 0.018 0.018 0.018
6 and Over 0.013 0.013 0.013 0.013
7.500-7.999 Under 6 0.02 0.02 0.02 0.02
6 and Over 0.015 0.015 0.015 0.015
8.000-8.499 Under 6 0.023 0.023 0.023 0.023
6 and Over 0.016 0.016 0.016 0.016
8.500-8.999 Under 6 0.025 0.025 0.025 0.025
6 and Over 0.017 0.017 0.017 0.017
9.000-9.499 Under 6 0.028 0.028 0.028 0.028
6 and Over 0.019 0.019 0.019 0.019
9.500-9.999 Under 6 0.03 0.03 0.03 0.03
6 and Over 0.02 0.02 0.02 0.02
10.000-10.999 All 0.034 0.034 0.034 0.034
11.000-11.999 All 0.035 0.035 0.035 0.035
12.000-12.999 All 0.036 0.036 0.036 0.036
13.000-13.999 All 0.037 0.037 0.037 0.037
14.000-15.000 All 0.038 0.038 0.038 0.038

Wall Tolerance

Wall Thickness Including .375″ to .875″ OD Over .875″ to 1.875″ OD Over 1.875″ to 3.750″ OD Over 3.750 “to 15.000” OD
(Inches) Plus Minus Plus Minus Plus Minus Plus Minus
0.035 0.002 0.002 0.002 0.002 0.002 0.002
0.049 0.002 0.002 0.002 0.003 0.002 0.003
0.065 0.002 0.002 0.002 0.003 0.003 0.003 0.004 0.004
0.083 0.002 0.002 0.002 0.003 0.003 0.003 0.004 0.005
0.095 0.002 0.002 0.002 0.003 0.003 0.003 0.004 0.005
0.109 0.002 0.003 0.002 0.004 0.003 0.003 0.005 0.005
0.12 0.003 0.003 0.002 0.004 0.003 0.003 0.005 0.005
0.134 0.002 0.004 0.003 0.003 0.005 0.005
0.148 0.002 0.004 0.003 0.003 0.005 0.005
0.165 0.003 0.004 0.003 0.004 0.005 0.006
0.18 0.004 0.004 0.003 0.005 0.006 0.006
0.203 0.004 0.005 0.004 0.005 0.006 0.007
0.22 0.004 0.006 0.004 0.006 0.007 0.007
0.238 0.005 0.006 0.005 0.006 0.007 0.007
0.259 0.005 0.006 0.005 0.006 0.007 0.007
0.284 0.005 0.006 0.005 0.006 0.007 0.007
0.3 0.006 0.006 0.006 0.006 0.008 0.008
0.32 0.007 0.007 0.007 0.007 0.008 0.008
0.344 0.008 0.008 0.008 0.008 0.009 0.009
0.375 0.009 0.009 0.009 0.009
0.4 0.01 0.01 0.01 0.01
0.438 0.011 0.011 0.011 0.011
0.46 0.012 0.012 0.012 0.012
0.48 0.012 0.012 0.012 0.012
0.531 0.013 0.013 0.013 0.013
0.563 0.013 0.013 0.013 0.013
0.58 0.014 0.014 0.014 0.014
0.6 0.015 0.015 0.015 0.015
0.625 0.016 0.016 0.016 0.016
0.65 0.017 0.017 0.017 0.017

Ovality shall be within the above tolerances except when the wall thickness is less than 3% of the OD. In those cases the additional ovality shall be as follows, but the mean diameter shall be within the specified tolerance.

Outside Diameter Additional Ovality Tolerance (Inches)
(Inches)
Up to 2 0.01
Over 2 – 3 0.015
Over 3 – 4 0.02
Over 4 – 5 0.025
Over 5 – 6 0.03
Over 6 – 7 0.035
Over 7 – 8 0.04
Over 8 – 9 0.045
Over 9 – 10 0.05
Over 10 – 11 0.055
Over 11 – 12 0.06
Over 12 – 12.500 0.065
Outside Diameter Straightness Tolerance for any 3′ of Length
< 8.000″ 0.030″
≥ 8.000″ 0.060″

Pressure Ratings, Steel Tubing for General Hydraulic System Applications

The following chart lists the nominal pressure ratings of tubing products which conform to SAE J524, SAE J525, SAE J526 and SAE J365.

Nominal Tube O.D. Nominal Tube Wall Thickness
0.028 0.035 0.049 0.065 0.083 0.093 0.109 0.120 0.134 0.148 0.156 0.188
inch mm 0.71mm 0.89mm 1.24mm 1.65mm 2.11mm 2.41mm 2.77mm 3.05mm 3.40mm 3.76mm 3.96mm 4.78mm
Reference Working Pressures at 4:1 Design Factor(psi/MPa)
0.125 6650 8450
3.18 46.0 58.5
0.188 4250 5450
4.77 29.5 37.5
0.250 3100 3950 5750 7800
6.35 21.5 27.0 39.5 54.0
0.312 2450 3100 4500 6150
7.92 16.8 21.5 31.0 42.5
0.375 2000 2550 3650 5000 6550 7600
9.53 13.8 17.6 25.0 34.5 45.0 52.5
0.500 1850 2700 3650 4800 5550 6450 7200
12.70 12.8 18.6 25.0 33.0 38.5 44.5 49.5
0.625 1500 2100 2850 3750 4350 5050 5600
15.88 10.4 14.5 19.6 26.0 30.0 35.0 38.5
0.750 1200 1750 2350 3050 3550 4150 4600
19.05 8.3 12.0 16.2 21.0 24.5 28.5 31.5
0.875 1050 1500 2000 2600 3000 3500 3900
22.23 7.2 10.4 13.8 18.0 20.5 24.0 27.0
1.000 900 1300 1750 2250 2600 3000 3350 3800 4200
25.40 6.2 9.0 12.0 15.5 18.0 20.5 23.0 26.0 29.0
1.125 1150 1550 2000 2300 2650 2950 3300 3700
28.58 7.9 10.6 13.8 15.8 18.2 20.5 23.0 25.5
1.250 1000 1350 1750 2050 2350 2650 2950 3300 3500 4300
31.75 6.9 9.3 12.0 14.2 16.2 18.2 20.5 23.0 24.0 29.5
1.500 1150 1450 1700 1950 2150 2450 2700 2850 3500
38.10 7.9 10.0 11.8 13.5 14.8 16.8 18.6 19.6 24.0
1.750 950 1250 1450 1650 1850 2050 2300 2400 2950
44.45 6.6 8.6 10.0 11.4 12.8 14.2 15.8 16.6 20.5
2.000 850 1100 1250 1450 1600 1800 2000 2100 2550
50.80 5.9 7.6 8.6 10.0 11.0 12.4 13.8 14.5 17.6

*Calculation of Design Pressures for Alternate Tubing Materials

*Design pressures for alternate tubing materials may be calculated using the Lame formula as follows: P=S((D2-d2)/(D2+d))where:

D= nominal outside diameter of tubing

d= nominal inside diameter of tubing

P= design pressure

S= allowable fiber stress of material at 4:1 design factor

Experienced 15+ Years

Our ability to purchase materials directly from leading mills at the best possible price will give you the competitive edge. This coupled with a skilled workforce dedicated to embracing the demands of the markets.

We Can Supply Follows Products with High Quality:

  1. Cold Rolled Steel Tube
  2. Cold Drawn Steel Tube
  3. Hollow Bar
  4. Honed Tube
  5. Plated Tube
  6. Plated Bar
  7. Boiler Tube

All Products According Quality Standard Strictly:

  1. ASTM: ASTM A519, ASTM A513.
  2. JIS:JIS G3441, JIS G3445, JIS G3466, JIS G3459.
  3. DIN: DIN1626, DIN1629, DIN2391, DIN2393, DIN2448, DIN2458.
  4. EN: EN10305.
  5. BS: BS6323.

Wide Range of Pipes to Fit Your Industry:

  1. OD from 5mm to 820mm.
  2. Wall Thickness from 0.1 to 100mm.
  3. Length up to 50mtr per pc.

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