fbpx

Tubes for mechanical and automobile

Seamless steel tubes for mechanical and automobile usage for backbone of automobile and rear axle tube, manufacturing and processing of precision equipments, instruments and apparatus.

Please send your inquiry by   sales@sunnysteel.com

Description

Seamless steel tubes for mechanical and automobile usage for backbone of automobile and rear axle tube, manufacturing and processing of precision equipments, instruments and apparatus.

Standard packaging is used to prevent damage to the material during shipping. If you need custom packaging for your order, please let us know what your requirements are and we will accommodate your specific needs.

Production Standard, Grade, Steel No:

  • DIN2391 St35, St45, St52
  • ASTM A519 1010, 1020, 1025, 1035, 1045
  • ASTM A513 1010, 1020, 1025, 1035, 1040
  • EN10305-1 E215, E235, E355

Your tubular products representative will be happy to work with you to develop the information that is required. Sunny Steel supply a 1/2 million foot inventory of carbon steel pressure tubing including boiler tubes, condenser tubes and heat exchanger tubes all made in the China.

Our carbon steel pressure tubing inventory is manufactured in accordance with ASME SA-178 A and/or ASME SA-214 in diameters of 3/4″ through 4”.

Application:

  • Backbone of Automobile and rear axle tube
  • Manufacturing and processing of precision equipments, instruments and apparatus

Delivery Condition: GBK, BKS, BK, BKW, NBK

Inspection and Test: Chemical Composition, Mechanical Properties, Visual and Dimension Test, NDT, Grain Size Test

Surface treatment: Oil-dip, Varnish, Shot Blasting

Chemical Composition (%) of ASTM A519

ASTM A519 covers several grades of carbon and alloy steel seamless mechanical tubing. The standard is also acceptable in the manufacture of piping.
Grade DesignationCMnP≤S≤SiCrMo
1008≤0.100.30-0.500.040.05---
10100.08-0.130.30-0.600.040.05---
10180.15-0.200.60-0.900.040.05---
10200.18-0.230.30-0.600.040.05---
10250.22-0.280.30-0.600.040.05---
10260.22-0.280.60-0.900.040.05---
41300.28-0.330.40-0.600.040.050.15-0.350.80-1.100.15-0.25
41400.38-0.430.75-1.000.040.050.15-0.350.80-1.100.15-0.25

Mechanical properties of ASTM A519

GradeConditionMPa Tenslle PointYield PointElongation
1020CW≥414≥483≥5%
SR≥345≥448≥10%
A≥193≥331≥30%
N≥234≥379≥22%
1025CW≥448≥517≥5%
SR≥379≥483≥8%
A≥207≥365≥25%
N≥248≥379≥22%
4130SR≥586≥724≥10%
A≥379≥517≥30%
N≥414≥621≥20%
4140SR≥689≥855≥10%
A≥414≥552≥25%
N≥621≥855≥20%

Standard hollow bar tolerances

Minimum Quantities

  • Hot-finished carbon and alloy—10,000 pounds, or 4,536 kilograms minimum.
  • Cold-drawn carbon and alloy—5,000 pounds minimum or 125 feet minimum, 2,268 kilograms minimum or 38.1 meters minimum, whichever is greater.
  • Quantity variation—standard ±10% of the ordered weight, or ±25 feet or 7.61 meters, whichever is greater.

Special Configurations

  • Tubular Products special seamless tubing configurations start with the highest quality steels.
  • Grade, chemical analysis and surface condition are carefully considered, and production processes are tailored to achieve the best tubing for the end use.
  • The configurations are formed from round tube by cold drawing.
  • The tube is drawn over a shaped mandrel or through a shaped die, or both. Improved tolerances, finishes and mechanical properties result.

Machining Allowances & Production Tolerances

Hollow bar is manufactured in the size ranges most frequently required by mechanical engineering manufacturing companies. However, in the case of hollow bar, the tolerance range for the outside diameter lies in the plus range, and for the inside diameter in the minus range. The wall thickness tolerance is determined by the degree of centre offset; this is due to the effect of the tolerance for the outside and inside diameter, the wall thickness and the centre offset. (See diagram below.)

In the case of mechanical tubing to ASTM A 511, the outside diameter and the wall dimensions generally lie in the centre of the tolerance range. Thus, when ordering product for machining it is important to take into account the differences in the tolerances between the hollow bar and the ASTM A 511 mechanical tubing specifications. In most cases the machining set up is based on centring the outside diameter.

Size Range

Tubular products seamless mechanical tubing is furnished in both cold-drawn and hot finished form in a wide range of sizes, from 1.375″ to 7.750″ OD and from 0.188″ to 1.625″ wall thickness.

ASTM standards for Mechanical tubing

Abbr.CorrespondingApplication
A511ASTM A511 / A511MSpecification for Seamless Stainless Steel Mechanical Tubing
A512ASTM A512 / ASME SA512Specification for Cold-Drawn Buttweld Carbon Steel Mechanical Tubing
A513ASTM A513 / A513MSpecification for Electric-Resistance-Welded Carbon and Alloy Steel Mechanical Tubing
A519ASTM A519 / A519MSpecification for Seamless Carbon and Alloy Steel Mechanical Tubing
A554ASTM A554Specification for Welded Stainless Steel Mechanical Tubing

Standard

The production of our seamless pipes is tightly regulated and all of the pipes we stock have been fully tested to international standards to ensure we only supply the highest quality products.

ASTM / ASME

American Society for Testing and Materials(ASTM), American Society of Mechanical Engineers (ASME)
Product nameExecutive standardDimension (mm)Steel code/ Steel grade
Black and Hot-dipped Zinc-coated Steel Pipes SeamlessASTM A530.3-1200 x 1.0-150GR.A, GR.B, GR.C
Seamless Carbon Steel for High Temperature ServiceASTM A10610.3-1200 x 1.0-150GR.B, GR.C
Seamless Cold-drawn Low-Carbon Steel Heat-Exchanger and Condenser TubesASTM A17910.3-426 x 1.0-36Low Carbon Steel
Seamless Carbon Steel Boiler Tubes for High PressureASTM A19210.3-426 x 1.0-36Low Carbon Steel
Seamless Cold-drawn Intermediate Alloy Steel Heat-exchanger and Condenser TubesASTM A19910.3-426 x 1.0-36T5, T22
Seamless Medium-carbon Steel Boiler and Superheater TubesASTM A21010.3-426 x 1.0-36A1, C
Seamless Ferritic and Austenitic Alloy Steel Boiler, Superheater and Heat-exchanger TubesASTM A21310.3-426 x 1.0-36T5, T5b, T9 , T11, T22 ,T91
Seamless Carbon and Alloy Steel for Mechanical TubingASTM A3331/4"-42" x SCH20-XXSGrade1 Gr. 3,Gr..6, Gr.8 , Gr. 9
Seamless Cold-drawn Carbon Steel Feedwater Heater TubesASTM A55610.3-426 x 1.0-36A2, B2
Round and shaped steel cold formed welded and seamless carbon steel structural pipe.ASTM A500OD :10.3-820 x 0.8- 75Grade A, B, C, D
Carbon and alloy steel mechanical tubing, either hot-finished or cold-finishedASTM A51910.3-426 x 1.0-361020, 1025, 4130, 4140
For seamless ferritic alloy-steel pipe for high-temperature serviceASTM A3351/4"-42" x SCH20-XXSA/SA 335 P1, P2, P11, P12, P15, P22, P91, P92, P122

Process

Cold drawn seamless steel tube deformed process

Cold Drawn Seamless Mechanical Tubing (CDS) is a cold drawn 1018/1026 steel tube which offers uniform tolerances, enhanced machinability and increased strength and tolerances compared to hot-rolled products. Cold drawn seamless steel tubes process Cold drawn steel tube is with hot-rolled steel coil as raw material, and tandem cold rolling pickled to remove oxide scale, its finished rolling hard roll, rolling hard volumes due to the continuous cold deformation caused by cold hardening strength, hardness increased indicators declined tough plastic, stamping performance will deteriorate, which can only be used for simple deformation of the parts. Rolling hard roll can be used as the raw material of the hot-dip galvanizing plant, hot dip galvanizing line set annealing line. Rolling hard roll weight is generally 6 to 13.5 tons, the coil diameter of 610mm.


Hot rolled seamless steel pipe deformed process

Hot-rolled seamless steel pipe production base deformation process can be summarized as three stages: perforation, extension and finishing. Hot rolled seamless steel pipe deformed process The main purpose of the perforation process is to become a solid round billet piercing hollow shell. Capillary in the specifications, accuracy and surface quality can not meet the requirements of the finished product, further improvements are needed to deform the metal through. The main purpose of the stretching machine is further reduced sectional view (main compression wall) for a larger axial extension, so that the capillary improved dimensional accuracy, surface quality and organizational performance. After stretching machine rolled steel pipe shortage collectively need further molding mill in order to achieve the requirements of the finished pipe. Rolled steel due to pass in the method widely used in the production of seamless steel tubes. So far, due to the method pass rolling steel can be divided into two categories: core pension without rolling rolling (hollow body rolling), and with the mandrel. Sizing machines, reducing mill and stretch reducing mill belonging to the hole without mandrel type continuous rolling mills are generally coffin. Its main purpose is to reduce the diameter of the deformation process or sizing get finished steel, the wall thickness of process control, can make thinning, thickening or nearly unchanged. All the traditional hole-type rolling machine with mandrel belong to extend machine. The main purpose is to reduce the deformation process perforated capillary wall thickness and outer diameter roll passes in the deformation zone and the mandrel posed, for a larger axial extension. At the same time a certain improvement in the organization, performance, accuracy, surface quality.


Cut to LengthASTM A210 seamless medium carbon steel boiler and superheater tubes

Before cutting pipe and tubing No matter the material, measure the diameter of the pipe or tube to be cut to ensure that you use the right-size tube cutter for the job. When determining how to make a straight cut, use a tape measure and a pencil or other writing instrument to mark on the surface where you want to cut. If possible, mark around the circumference of a pipe, especially when cutting with a handsaw. Ensure that a cut is as straight as possible by securing the pipe with a vise, clamp, miter box or even duct tape to keep the length from shifting out of place while cutting. After cutting pipe and tubing

  • Unless a cut is perfectly clean, you should expect to remove burrs from around the edge, especially after sawing.
  • Use a deburring tool to clean the edge after tube cutting.
  • You may opt to use a metal file on the cut of a metal pipe.

Inspection

Size inspection

Geometrical inspection of steel pipes The outer diameter, wall thickness, bending and length of the steel pipe can be inspected on the inspection table with an outer caliper, a micrometer and a bending ruler, and a length tape measure.

Tolerances of pipes you should notice

Take seamless steel pipe as an example, there are some tolerances that affect quality. Noting this, and you will get a better pipe.

Weight tolerance
For pipe NPS 12 (DN300, 323.8mm) and under, the weight shall vary within -3.5% / +10%.

For pipe over NPS 12 (DN300, 323.8mm), the weight shall vary within -5% / +10%.

Pipe of NPS 4 (DN100, 114.3mm) and smaller may be weighed in convenient lots; pipe in sizes larger than NPS 4 shall be weighed separately.

Quantity tolerance
Normally mills take -10% to +10% tolerance, but TPMCSTEEL keeps ±3% variation.

Length tolerance
For Seamless pipe& tube, if definite cut lengths are ordered, the length shall vary within -0mm / +6mm.

Dimension tolerances of seamless steel pipe

Pipe typesPipe Szie(mm)Tolerances
Hot rolledOD<50±0.50mm
≥50±1%
WT<4±12.5%
≥4-20+15%, -12.5%
>20±12.5%
Cold drawnOD6-10±0.20mm
10-30±0.40mm
30-50±0.45
>50±1%
WT<1±0.15mm
>1-3+ 15%, – 10%
>3+ 12.5%, – 10%
StandardHot finished seamless tubeCold flnished seamless tube
Out diameter
(mm)
ToleranceOut diameter
(mm)
Tolerance
EN10216-1≤100 +/-0.75%
(min.+/-0.5mm)
All +/-0.5%
EN10216-2(min. +/-0.30mm)
DIN17175>100 +/-0.90%
GB/T 3087≤460 +/-0.75%
(min.+/-0.5mm)
 10-30  +/-0.40mm
>30-50 +/-0.45mm
>50 +/-1.0%
GB/T 5310
GB/T 9948
GB/T 6479
<57 +/-0.40mm≤30 +/-0.20mm 
 57-325  +/-0.75%>30-50  +/-0.30mm 
>325-460 +1%,-2mm>50 +/-0.8% 
ASME SA-179M
ASME SA-192M
ASME SA-209M
ASME SA-210M
ASME SA-213M
JIS G 3461
JIS G 3461
≤101.6 +0.4, -0.8mm<25.4 +/-0.10mm
>25.4-38.1 +/-0.15mm
>38.1-50.8 +/-0.20mm 
101.6-190.5 +0.4, -1.2mm>50.8-63.5 +/-0.25mm
>63.5-76.2 +/-0.30mm 
>76.2 +/-0.38mm
ASME SA106
ASME SA335
≤48.3 +/-0.40mm ≤48.3 +/-0.40mm
 48.3-114.3 +/-0.79mm 
114.4-219.1 +1.59, -0.79mm 
219.2-323.9 +2.38, -0.79mm>48.3 +/-0.79mm 
>324 +/-1.0%

Tolerances on wall thickness

The wall thickness at any point shall be within the below tolerance table.
StandardHot finished seamless tubeCold flnished seamless tube
DIN17175Out diameter
OD(mm)
Wall thickness
T(mm)
ToleranceOut diameter
(mm)
Wall Thickness
T(mm)
Tolerance
≤130S≤2Sn +15%, -10%   --All +/-10%
(min. +/-0.2mm)
2Sn +12.5%, -10% 
S>4Sn +-/9%
>130S≤0.05da +17.5%, -12.5% 
0.05da +/-12.5% 
S>0.11da +/-10% 
EN 10216-1
EN 10216-2
 ≤219.1  -   +/-12.5%
(min.+/-0.4mm) 
 -- T/D≤0.025 +/-20% 
0.025 +/-15% 
0.05 +/-12.5% 
0.1 +/-10% 
GB/T 3087 -- ≤20 +15%,-12.5%
(min.+0.45, -0.35mm)
 --  1.0-3.0  +15%, -10% 
>20 +/-12.5%  -- >3 +12.5%, -10% 
GB/T 5310
GB/T 9948
GB/T 6479
 -- <4.0 +15%,-10%
(min.+0.48, -0.32mm)
 --  2-3  +12%,-10% 
 4-20  +12.5%,-10% >3 +/-10% 
>20 +/-10%
ASME SA-179M
ASME SA-192M
ASME SA-209M
ASME SA-210M
ASME SA-231M
JIS G 3461
JIS G 3462
 --  2.41-3.8  +35%, -0% ≤38.1 --  +20%,-0% 
 3.8-4.6  +33%,-0% >38.1 -- 22%,-0% 
>4.6 +28%,-0%  --  --  -- 
ASME SA-106
ASME SA-335
 -- All +/12.5% All +/-10% 

Note:

  1. The size in the table above is for the hot-rolled tubes.
  2. The size of the green area is the regular specification, we can accept orders directly, but the yellow area shall be subject to a technical evaluation.
  3. The Out side diameter (O.D) and wall thickness (W.T.) of the tube should be complied.

PMI test

Positive material identification (PMI) testing is the examination of a material, usually a metallic alloy, to confirm the material is consistent with the user’s request.

Delivery

Steel pipe delivery status(condition)

Steel pipe delivery status(condition): cold / hard (BK), cold / soft (BKW), after cold stress relief annealing (BKS), annealing (GBK), normalized (NBK).

Condition on delivery of steel pipe

TermSymbolExplanation
Cold-finished/hard (cold-finished as-drawn)BKNo heat treatment after the last cold-forming process. The tubes therefore have only low deformability.
Cold-finished/soft (lightly cold-worked)BKWAfter the last heat treatment there is a light finishing pass (cold drawing) With proper subsequent processing, the tube can be cold-formed (e.g. bent, expanded) within certain limits.
AnnealedGBKAfter the final cold-forming process the tubes are annealed in a controlled atmosphere or under vacuum.
NormalizedNBKThe tubes are annealed above the upper transformation point in a controlled atmosphere or under vacuum.
The general cold strip mills, volume should go through continuous annealing (CAPL unit) to eliminate cold hardening and rolling stress, or batch annealing reach the mechanical properties of the corresponding standard specifies. Cold rolled steel surface quality, appearance, dimensional accuracy better than hot-rolled plate, and right-rolled thin product thickness is about 0.18mm, so the majority of users favor.

Cold rolled steel coil substrate products deep processing of high value-added products. Such as electro-galvanized, hot dip galvanized, electro-galvanized fingerprint resistant, painted steel roll damping composite steel, PVC laminating steel plates, etc., so that the excellent quality of these products has a beautiful, high resistance to corrosion, has been widely used.

Cold rolled steel coil finishing after annealing, cut the head, tail, trimming, flattening, smooth, heavy volume, or longitudinal clipboard. Cold-rolled products are widely used in automobile manufacturing, household electrical appliances, instruments, switches, buildings, office furniture and other industries. Steel plate strapping package weight of 3 to 5 tons. Flat sub-volume typically 3 to 10 tons / volume. Coil diameter 6m.


Packing

There are probably hundreds of different methods for packing a pipe, and most of them have merit, but there are two principles that are vital for any method to work prevent rusting and Sea transportation security.

  • Plastic caps plugged at the two sides of pipe ends
  • Should be avoided by the steel strapping and transport damage
  • Bundled signs should be uniform and consistent
  • The same bundle(batch) of steel pipe should be came from the same furnace.
  • The steel pipe has the same furnace number, the same steel grade, the same specifications.

Our packing can meet any needs of the customers.

Inquiry

Need to inquire about our products? Fill out the form below and our staff will be in touch!

Contact Form Demo

FAQ

Q: How long is your delivery time? A: The delivery time of customized products is generally 25 35 days, and non customized products are generally shipped within 24 hours after payment. Q: Do you provide samples? Is it free? A: If the value of the sample is low, we will provide it for free, but the freight needs to be paid by the customer. But for some high value samples, we need to charge a fee. Q: What are your payment terms? A: T/T 30% as the deposit,The balance payment is paid in full before shipment Q: What is the packaging and transportation form? A: Non steaming wooden box and iron frame packaging. Special packaging is available according to customer needs. The transportation is mainly by sea. Q: What is your minimum order quantity? A: There is no minimum order quantity requirement. Customized products are tailor made according to the drawings provided by the customer.