09CrCuSb (ND steel) steel pipe

09CrCuSb (ND steel) steel pipe used in power plants and refineries to manufacture economizers, air preheaters, heat exchangers and evaporators that work in high-sulfur flue gas to protect against sulfur-containing flue gas condensation.

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09CrCuSb (ND steel) resistant to sulfuric acid low temperature dew point corrosion steel (ND steel, ND steel, 09CrCuSb steel, 09CrCuSb steel, etc.). Usually called 09 club.

09CrCuSb ND steel is a new type of steel resistant to sulfuric acid low temperature dew point corrosion developed by Shanghai Institute of materials and Xingcheng Special Steel from 1987 to 1990. ND steel is a low alloy structural steel. Compared with other steels such as low carbon steel, corten and cr1a, ND steel has excellent corrosion resistance and mechanical properties.

09CrCuSb (ie ND steel)


  • Q/TDGG0039-2004—–Industry internal standard
  • GB 150.2-2011 – Pressure Vessels Part 2

The main production of steel pipe grade:

  • 09CrCuSb (ND steel pipe)

Material standards

①GB 150.2-2011 “Pressure Vessel Part 2: Materials”

②NB/T 47019-2011 “Technical conditions for ordering boiler and heat exchanger tubes”

③SH/T 3096-2012 “Principle of Material Selection for High Sulfur Crude Oil Processing Equipment and Pipeline Design”

Composition specification (GB 150.2-2011)

C ≤0.12 Cr 0.70~1.10
Si 0.20~0.40 Cu 0.25~0.45
Mn 0.35~0.65 Sb 0.04~0.10
P ≤0.030 S ≤0.020

Mechanical Property

Nominal Thickness


Tensile Strength


Yield Strength




≤8 390~550 ≥245 ≥25

Corrosion resistance

In sulfuric acid of medium-temperature and medium concentration, ND steel is passivated due to dissolution, and a passivation layer rich in alloy elements such as Cu, Cr, Sb (antimony, sound: tī) is formed on the surface of the steel and has a high Sulfuric acid corrosion resistance.

Corrosion rate comparison between ND steel and other steels (70℃-50% H2SO4 solution)

Type of Steel Corrosion Rate


ND (09CrCuSb) 7.3 1
A3 (Q235B) 103.5 14.18
CORTEN-A 63 8.63
CR1A 13.4 1.84
321 21.7 2.97
S-TEN 1 & 2 27.4 3.75

For the corrosion resistance, GB 150.2-2011 stipulates: The steel pipe shall be tested for corrosion resistance, and one sample shall be taken from each of the two steel pipes in each batch, and each sample shall be a pipe length of 10 mm. Soak in a H2SO4 solution with a mass fraction of 50% at a constant temperature of 70°C (±2°C) for 24 hours. The average value of the corrosion rate of the two samples is not greater than 80g/m2×h or 140g/m2×h, the specific indicators are indicated in the order contract.

Corrosion resistance
In sulfuric acid of medium temperature and concentration, ND steel is passivated due to dissolution. A passivation layer rich in Cu, Cr, Sb and other metal elements is formed on the surface of ND steel, which has high sulfuric acid corrosion resistance.
Comparison of corrosion rate between ND steel and other steel grades (70 ℃ – 50% H2SO4 solution)
Steel grade 09CrCuSb(ND steel) CRIR(Japan) 1Cr18Ni9 Corten STEN(Japan) A3(Q235B)
Corrosion rate 7.30 13.40 21.70 63.00 27.4 103.50
multiple 1 1.84 2.97 8.63 3.75 14.11
ND steel pipe (09CrCuSb) shall be tested for corrosion resistance

ND steel pipe (09CrCuSb) shall be subject to corrosion resistance test. One sample shall be taken from each batch of two steel pipes, and each sample is a 10 mm long pipe section. Soak in 50% H2SO4 solution at 70 ℃ (± 2 ℃) for 24 hours. The average corrosion rate of two samples shall not be greater than 80g / ㎡ * h or 140g / ㎡ * h, and the specific index shall be indicated in the order.

09CrCuSb welding material

The carbon equivalent of 09CrCuSb is moderate, the content of S and P is not high, so its welding performance is good, preheating is not necessary during welding, and heat treatment is not required after welding ND steel special NDS electrode is used for welding.


Specification Specification
19*2-4mm 76-114 * 4-10mm
25 * 2-4mm 133-140 * 6-14mm
32 * 2-5mm 159-219 * 21-35mm
38-42 * 3-5mm 273-325 * 7-50mm
51-63 * 3-5mm 356-630 * 10-20mm

09CrCuSb (ND steel) steel is developed for coal-fired boilers, oil-fired boilers; heat exchangers for electric furnaces, pipes, chimneys, boiler air preheaters, economizers, heat exchangers, condensing coolers, evaporators, etc. Hot-rolled steel sheets and steel pipes with excellent resistance to sulfuric acid dew corrosion. Its superior resistance to sulfuric acid dew point corrosion and very high cost performance is the best material that can completely replace stainless steel and surpass stainless steel (in terms of sulfuric acid dew point corrosion resistance). ND steel has great economic significance, in line with today’s high efficiency, longevity and energy saving. “Green” concepts such as environmental protection and national development policy orientation.

Advantage of 09CrCuSb (ND steel)
ND steel, 09CrCuSb steel, is the most ideal steel for “sulfuric acid resistant low temperature dew point corrosion” at home and abroad. ND steel is widely used in the manufacture of economizers, air preheaters, heat exchangers and in high sulfur flue gas. Equipment such as evaporators, used to resist corrosion of sulfur-containing flue gas dew point. ND steel also has the ability to resist chloride ion corrosion. The main reference index of ND steel pipe (soaked in 50% H2SO4 solution at 70 °C for 24 hours) is higher than that of carbon steel and stainless steel.


09CrCuSb seamless steel pipe is widely used in the manufacture of economizer, air heat preheater, heat exchanger, evaporator and other equipment serving in high sulfur gas, which is used to resist condensation corrosion of sulfur-containing flue gas. It is characterized by resistance to low temperature sulfuric acid dew point corrosion of flue gas below 200 ° C. It is a new clean energy-saving product.

The market price of the special sulfuric acid dew point corrosion resistant pipe for 09CrCuSb boiler heat exchanger is about 9000 yuan per ton, only 40% of the price of stainless steel pipe of the same specification. When it is used in sulfur-containing medium, its corrosion resistance is no less than that of stainless steel, and the corrosion rate is 3.481mg/cm2. H (34.81g / m2. H) in sulfuric acid solution of 70 ℃ and 50%. The corrosion resistance of ND steel (09CrCuSb) is more than 3 times that of 321 stainless steel and 7 times that of 20g. It can be seen that ND steel is the first choice material for the experimental chemical plant in the environment of sulfur-containing medium.

ND steel is currently the most ideal steel for “sulfuric acid low-temperature dew point corrosion resistance” at home and abroad, and its seamless steel tubes are widely used in the manufacture of economizers, air preheaters, heat exchangers and evaporations that are used in high sulfur flue gas The device and other equipment are used to resist the dew point corrosion of sulfur-containing flue gas.


09crcusb seamless tube packing 04 09crcusb seamless tube packing 03 09crcusb seamless tube packing 02 09crcusb seamless tube packing 01


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.


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



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.


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
≥4-20+15%, -12.5%
Cold drawnOD6-10±0.20mm
>1-3+ 15%, – 10%
>3+ 12.5%, – 10%
StandardHot finished seamless tubeCold flnished seamless tube
Out diameter
ToleranceOut diameter
EN10216-1≤100 +/-0.75%
All +/-0.5%
EN10216-2(min. +/-0.30mm)
DIN17175>100 +/-0.90%
GB/T 3087≤460 +/-0.75%
 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% 
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
≤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
Wall thickness
ToleranceOut diameter
Wall Thickness
≤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%
 -- 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%
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%  --  --  -- 
 -- All +/12.5% All +/-10% 


  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.


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

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.


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.


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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.