09CrCuSb (ND Steel) Seamless Tubes

09CrCuSb (ND steel) Tubes are widely used in the manufacture of economizer, air preheater, heat exchanger, and evaporator in the service of high sulfur flue gas equipment, used to resist the dew point corrosion of sulfur flue gas. 09CrCuSb Seamless Tubes also have the ability of chloride ion corrosion resistance. 09CrCuSb Tubes from China are used in power plants and refineries to manufacture coal economizers, air preheaters, heat exchangers, and evaporators, which work in the high sulfur flue gas to resist condensation corrosion of sulfur flue gas. It is the ideal steel for low-temperature dew point corrosion resistance of sulfuric acid at home and abroad. Low-alloy 09CrCuSb Tubes are also widely used.

09CrCuSb Seamless Tubes’ General Information:

Major exporting countries: Thailand, Vietnam.

Standard: GB 150.2-2011 “Pressure Vessel Part 2: Materials” GB3087, GB5310, GB8163.

Description Name: 09CrCuSb Seamless Steel Tubes, 09CrCuSb Seamless Pipes, ND Steel tubes. 09CrCuSb boiler tubes.

Size:1/2inch to 5inch (12.7mm to 127mm).

Thickness: 0.8mm to 13mm.

Shape: Round.

Length: Single random length/ Double random length or as customer’s actual request. Max length 18000mm.

Production process: Cold drawn or hot rolled.

Delivery Condition: Normalized or Annealed.

Referenced Documents:

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

GB 3087-2016 “Seamless steel tubes for low and medium pressure boilers”

GB 5310-2017 “Seamless steel tubes for high-pressure boilers”

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

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

09CrCuSb Seamless tubes’ Characters:

09CrCuSb Chemical Composition:

09CrCuSb Chemical Composition (%)
C	Si	Mn	P	S	Cr	Cu	Sb
≤0.12	0.20-0.40	0.35-0.65	≤0.030	≤0.020	0.70-1.10	0.25-0.45	0.04-0.10

09CrCuSb Tubes Mechanical Property:

09CrCuSb Tubes Mechanical properties At RT (EN ISO 6892-1)
Tensile	Yield	Elongation	Corrosion resistance rate
Strength Rm (MPa)	Strength ReL (MPa)	A (%)	mg/cm².h
390-550	≥245	≥25	7.4

09CrCuSb have good Corrosion resistance

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

TP347H tubes hardness test

Corrosion rate comparison between 09CrCuSb (ND Steel) and other Steels (70°C-50% H2SO4 Solution)

Steel Grade	Corrosion Rate (mg/cm².h)	Multiple
09CrCuSb (ND)	7.3	1
Corten-A	63	8.63
CRIA(Japan)	13.4	1.84
A3(Q235B)	103.5	14.18
TP321(1Cr18Ni9)	21.7	2.97

*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 an 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.

Tests

Flattening Test

One flattening test shall be made on specimens from each end of one finished tube, not the one used for the flaring test, from each lot.

Flange Test

One flange test shall be made on specimens from each end of one finished tube, not the one used for the flattening test, from each lot.

Hydrostatic or Nondestructive Electric Test

Each tube shall be subjected to either the hydrostatic or the nondestructive electric test. The purchaser may specify which test is to be used.

100%Hydrostatic test (optional).
100%Eddy Current test.
100% ultrasonic test.

Markings

In addition to the marking prescribed in Specification A 1016/A 1016M, the marking for 09CrCuSb shall also include the size, the heat number, and the lot number.