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Pipe for chemical equipment

Implement GB 9948, GB 6479 for seamless steel tube & pipe used for pressure pipes such as petroleum and chemical furnaces, refineries, crackers, hydrogen units, heat exchangers etc.

Please send your inquiry by   sales@sunnysteel.com

Description

Implement GB 9948, GB 6479 for seamless steel tube & pipe used for pressure pipes such as petroleum and chemical furnaces, refineries, crackers, hydrogen units, heat exchangers etc.

UsageSteel GradeSpecification
Pipe used for Petroleum Cracking20, 12CrMo, 15CrMo, 12Cr2Mo, 12Cr1MoV,GB 9948
12Cr5MoI, 12Cr5MoNT, 12Cr9MoI, 12Cr9MoNT,
Pipe used for High Pressure20, Q345B, Q345C, Q345D, Q345E, 12CrMo,GB 6479
Chemical Fertilizer Equipment15CrMo, 12Cr2Mo, 12Cr5Mo, 10MoWVNb

Mechanical properties for GB 9948 Seamless steel pipe

Gadetensile strength (MPa)yield strength (MPa)elongation (%)impact energy (J)Brinell hardness (HB)delivery status
10330-490≥205≥24//Normalizing
20410-550≥245≥21≥39/Normalizing
15CrMo440-640≥235≥21≥47≤170Normalizing + tempering
1Cr2Mo≥390≥175≥22≥92≤179Normalizing + tempering
1Cr5Mo≥390≥195≥22≥92≤187annealing

Chemical composition for GB 9948 Seamless steel pipe

GadeCSiMnPSCrMoNi
100.07-0.140.17-0.370.35-0.65≤0.035≤0.035≤0.15/≤0.25
200.17-0.240.17-0.370.35-0.65≤0.035≤0.035≤0.25/≤0.25
15CrMo0.12-0.180.17-0.370.40-0.70≤0.035≤0.0350.80-1.100.40-0.55≤0.30
1Cr2Mo≤0.150.50-1.000.30-0.60≤0.035≤0.0302.15-2.850.45-0.65/
1Cr5Mo≤0.15≤0.50≤0.60≤0.035≤0.0304.00-6.000.45-0.60≤0.60
General GB 9948 seamless steel pipe use temperature below 450 ° C, domestic pipe is mainly made of 10, 20 carbon steel hot-rolled pipe or cold drawn pipe.

Chemical Component of GB6479-2013

GradeCSiMnCrMoVWNbNiP S(No More Than)
100. 07-0. 130. 17 -0. 370.35 -0. 65------0.0250.015
200. 17 -0. 230.17 -0. 370. 35-0.65------0.0250.015
Q345Ba0. 12 -0. 200.20-0. 501.20-1.70<0. 30<0. 10Mis-<0.07W0. 500.0250.015
Q345C"0. 12 -0. 200.20 -0. 501.20 -1. 70W0. 30<0. 10<0. 15-W0.07<0. 500.0250.015
Q345D"0. 12 -0. 180.20 -0. 501. 20-1.70W0. 30<0. 10<0. 15-W0.07<0. 500. 0250.015
Q345Ea*B0. 12 -0. 180. 20-0. 501. 20 -1.70W0. 30<0. 10<0. 15-<0.07<0. 500. 0250.01
12CrMo0. 08-0. 150.17 -0. 370. 40-0. 700. 40-0. 700. 40-0. 55----0. 0250.015
15CrMo0. 12 -0. 180. 17 -0. 370. 40-0. 700. 80-1. 100. 40-0.55----0. 0250. 015
12Cr2Mo0. 08-0. 15<0. 500. 40-0.62.00-2. 500. 90-1. 13----0.0250. 015
12Cr5Mo<0. 15<0.50<0. 604. 00-6.000. 40-0. 60---<0. 600. 0250. 015
LOMoWVNb0. 07-0. 130. 50-0.80. 50-0.8-0. 60-0. 900. 30-0. 500. 50-0. 900. 06-0. 12-0.0250.015
12SiMoVNb0.08 -0. 140.50 -0.80. 60-0. 90-0. 90-1. 100. 30-0. 50-0. 04-0.08-0.0250.015
Awhen It Is Necessary To Add Fine Grain Elements, The Steel Shall Contain At Least One Of Al, Nb, V And Ti. The Added Fine Grain Elements Shall Be Indicated In The Quality Certificate. Ti Content Shall Not Be More Than 0.20%

BAl Content In Steel Shall Not Be Less Than 0.020%, Or Ala Content In Steel Shall Not Be Less Than 0.015%

Mechanical Property of GB6479-2013

Mechanical Property
GradeTensile (MPa)Yield (MPa)Elong After Fracture A/%Reduction Of Area (Z/%)Shork Absorption Energy
(KV2)/J
Steel Tube Wall Thickness/MmTest Temperature/℃PortraitTransver
W16>16 — 40>40PortraitTransver
Not Less ThanNot Less Than
10335-4902051951852422
20410-550245235225242204027
Q345B490-6703453353252119204027
Q345C490-670345335325211904027
Q345D490-6703453353252119-204027
Q345E490-6703453353252119-404027
12CrMo410-5602051951852119204027
15CrMo440-6402952852752119204027
12Cr2Moa450-6002802018204027
12Cr5Mo390-5901951851752220204027
LOMoWVNb470-6702952852751917204027
12SiMoVNb2470315305295191750204027

How do alloying elements affect the performance of cryogenic steels?

We usually call the steel used the temperature range -10 to -273℃ as low-temperature steel or cryogenic steel According to alloying element content and structure, cryogenic steels can be divided into: Aluminum killed C-Mn steel such as 06MnVTi, 06MnVal, 09Mn2Vre, 06MnNb steel, low alloy ferric body low-temperature steel 0.5Ni, 2.5Ni, 3Ni, 3.5Ni, etc., Martensiform low-temperature steels such as 9Ni, 5Ni steel, high alloy austenitic low-temperature steels such as 1Cr18Ni9Ti and 20Mn23Al and so on.

The effect of alloying elements in low-temperature steels mainly refers to its effect on the low-temperature toughness of steels:

Mn

Manganese can improve obviously the low-temperature toughness of steel. Manganese mainly exists in the form of solid solution in steel and plays the role of solid solution strengthening. In addition, manganese is an element that enlarges the austenite region and reduces the transformation temperature (A1 and A3). It is easy to obtain fine and ductile ferrite and pearlite grains, which can increase the maximum impact energy and significantly reduce the brittle transition temperature. In general, the Mn/C ratio should be equal to 3, which can not only reduce the brittle transition temperature of steel, but also compensate for the decrease of mechanical properties caused by the decrease of carbon content due to the increase of Mn content.

Ni

Nickel can alleviate the tendency of brittle transition and significantly reduce the temperature of brittle transition. The effect of nickel on improving the low-temperature toughness of steel is 5 times that of manganese, that is, the brittle transition temperature decreases by 10℃ with the increase of nickel content by 1%. This is mainly because of nickel with carbon, absorbed by the solid solution and reinforcement, nickel also makes a move to the left point of eutectoid steel eutectoid point to reduce the carbon content, reduce the phase transition temperature (A1 and A2), in comparison with the same carbon content of carbon steel, decrease in the number of ferrite and refining, pearlite populations (the carbon content of pearlite is also lower than carbon steel). The experimental results show that the main reason why nickel increases the toughness at low temperature is that nickel-containing steel has more movable dislocations at low temperature and is easier to cross slip. For example, medium alloy low carbon martensiform low-temperature steel 9Ni steel, has high low-temperature toughness, can be used for -196℃. The 5Ni steel developed on the basis of 9Ni steel has good low-temperature toughness at -162~-196℃.

C

With the increase of carbon content, the brittle transition temperature of steel increases quickly and the welding property decreases, so the carbon content of low-temperature steel is limited to less than 0.2%.

P, S, Sn, Pb Sb

Phosphorus, sulfur, arsenic, tin, lead, antimony: these elements are not conducive to the low-temperature toughness of steel.

They segregate in the grain boundary, which reduces the surface energy and resistance of the grain boundary, and causes the brittle crack to originate from the grain boundary and extend along the grain boundary until the fracture is complete.

Phosphorus can improve the strength of steel, but it will increase the brittleness of steel, especially at low temperatures. The brittle transition temperature is obviously increased, so its content should be strictly limited.

O, H, N

These elements will increase the brittle transition temperature of steel. Deoxidized silicon and aluminum killed steels can improve the toughness at low temperatures, but because silicon increases the brittle transition temperature of steels, aluminum killed steels have a lower brittle transition temperature than silicon killed steels.

Main steel products and application

Steel GradeGB(China)ASME(USA)DIN/EN(Euro)JIS(Jpan)Application
Carbon steel10A106St35.8STB340Economizer tube Water wall tube, pipeline, header pipe, Petrochemical furnace tube, heat exchange tube
20SA-106BSt45.8STB410
20GSA-106CP235GHSTB510
20MnGSA-192P265GH
25MnGSA-210A1
Q345B/C/D/ESA-210C
Mo steel15MoGSA-209 T116Mo315Mo3Water wall tube
Superheater tube
Reheater tube
20MoGSA-209 T1a16Mo3
SA-209 T1b
Cr-Mo Steel12Cr1MoG12Cr1MoVSuperheater tube
Reheater tube,
Pipeline, Header pipe, Petrochemical furnace tube, Heat exchange tube
Cr-Mo-V steel12Cr2MoWVTiB14MoV63
Cr-Mo-Steel12CrMoGT11/P1110CrMo5-5STB20
Cr-Mo-W Steel15CrMoGT12/P1212CrMo4-5STB22
Cr-Mo Steel12Cr2MoGT22/P2210CrMo9-10STB23Superheater tube, Reheater tube, Main steam pipe, Pipleline, Header pip, Petrochemical furnace tube, Heat exchange tube
Cr-Mo-W steel10Cr9Mo1VNbNT23/P237CrWVMoNb9-6STB24
10Cr9MoW2VNbBNT24/P247CrMoVTIB10-10STB25
12Cr1MoT5/P5X10CrMoVNb9-1STB26
12Cr5Mol/NTT9/P9X10CrWMoVNb9-2
12Cr9Mol/NTT91/P91X11CrMo5+l/NT
T92/P92X11CrMo9-1+l/NT
Carbon steel16MnDGA333-1STPL380Tube & pipe for Low-temperature service
Ni steel10MnDGSA-333-1STPL450
09DGA333-6
SA-333-6
A333-3
SA-333-3
Austentic Stainless steel  ---  AP304  TP304H  ---  Superheater tube, Reheater tube
TP321 TP321H
TP347 TP347H
TP316 TP316H
S30432 TP310HCbN

 

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.