Duplex steel

duplex steel S32760 Tubes Pipes EN 10216-5 1.4501 F55 Seamless Tubing piping

OD:4-426mm THK:0.5-25mm
SUFACE:AP(Annealed and pickling) / MP(mechanically polish)/BA(bright annealed)
Product description: duplex steel S32760 Tubes Pipes EN 10216-5 1.4501 F55 Seamless Tubing piping,S32760 1.4501 F55 pipes tubes, S32760 1.4501 F55 tubing piping, Stainless steel duplex steel S32760 1.4501 F55 pipes tubes,
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duplex steel S32760 Tubes Pipes EN 10216-5 1.4501 F55 Seamless Tubing piping

Key words

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Introduce:

Super Duplex stainless steel – with a microstructure of 50:50 austenite and ferrite, the steel has improved strength over ferritic and austenitic steel grades. With a higher than average Molybdenum and Chromium content, the material has greater heat and corrosion resistant qualities.With reduced production costs when compared with equivalent austenitic and ferritic grades and with greater yield and tensile strength, SuperDuplex is a cost effective solution for the consumer. It is conceivable that material thicknesses for a project may be reduced if SuperDuplex is used, thus reducing cost without compromising quality.

ASTM A789 ASME SA 789 S32760 Super Duplex Steel Pipe, EN 10216-5 1.4501 Super Duplex has enhanced pitting and crevice corrosion resistance compared with the ordinary austenitic or duplex types. This is due to the further additions of chromium, molybdenum, and nitrogen to these grades. UNS S32760, F55, 1.4501 combines high strength and good ductility with outstanding corrosion resistance. With UNS S32760, F55, 1.4501 having these attribute it is used in a wide range of marine, oil and gas environments. UNS S32760, F55, 1.4501 is the most common super duplex grade.

Super Duplex Alloy UNS S32760 (1.4501) has excellent corrosion resistance to a wide variety of media, with outstanding resistance to pitting and crevice corrosion in seawater and other chloride containing environments, with Critical Pitting Temperature exceeding 50°C.UNS S32760, F55, 1.4501 Super Duplex has enhanced pitting and crevice corrosion resistance compared with the ordinary austenitic or duplex types. This is due to the further additions of chromium, molybdenum, and nitrogen to these grades. UNS S32760, 1.4501 combines high strength and good ductility with outstanding corrosion resistance.

Providing higher strength than both austenitic and 22% Cr Duples Stainless Steel UNS S32760 (F55) is suited to a variety of applications in industries such as Chemical Processing, Oil & Gas, and Marine environments. Super Duplex Alloy UNS S32760 (F55 / 1.4501) has excellent corrosion resistance to a wide variety of media, with outstanding resistance to pitting and crevice corrosion in seawater and other chloride containing environments, with Critical Pitting Temperature exceeding 50°C.

Table1.ASTM A789 ASME SA 789 S32760 Super Duplex Steel Pipe Chemical Composition

C.	Cr.	Cu.	Mn.	Mo.	N.	Ni.	P.	S.	Si.	W.
0.030%	24.00-	0.50-	1.00%	3.00-	0.20-	6.00-	0.035%	0.010%	1.00%	0.50-
max	26.00%	1.00%	max	4.00%	0.30%	8.00%	max	max	max	1.00%

Table2.tensile Strength and Hardness Requirements

Grade

Tensile strength,

min., ksi [MPa]

Yield strength,

min., ksi [MPa]

Elongation in 2 in., or 50mm,

min, %

Hardness,

Max Brinell

S32760

109 [750]

80 [550]

300

Table3.S32760 Super Duplex Steel Tubing Minimum Mechanical Properties at Room Temperature sample
(EN10088-3 1.4501 UNS S32760 OD19.05mm,WT1.65mm - Annealing and Pickeling)

Tensile (UTS)	678-692N/mm²
0.2% Proof Stress	530 N/mm² Min
Elongation	29-30%
Hardness(Rockwell)	29/30
Impact	100J

Benefits of UNS S32760 Super Duplex Stainless Steel

· Increased tensile & yield strength

· Good ductility and toughness

· SCC resistance

· Corrosion resistance is better than Duplex

· Cost effective

S32760 Super Duplex Steel Pipe Corrosion Resistance

The high chromium and molybdenum content of Super Duplex makes it extremely resistant to uniform corrosion by organic acids like formic and acetic acid. Super Duplex also provides excellent resistance to inorganic acids, especially those containing chlorides.

ASTM A789 / ASME SA789 covers grades of average wall thickness, or, if specified on the order, minimum wall thickness, of stainless steel tubing for services requiring general corrosion resistance, with particular emphasis on resistance to stress corrosion cracking. These steels are suscep- tible to embrittlement if used for prolonged periods at elevated temperatures.
The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in non-conformance with the standard. Within the text, the SI units are shown in brackets. The inch-pound units shall apply unless the M designation of this specification is specified in the order.

Referenced Documents

ASTM Standards:
A480/A480M Specification for General Requirements for Flat-Rolled Stainless and Heat-Resisting Steel Plate, Sheet, and Strip
A1016/A1016M Specification for General Requirements for Ferritic Alloy Steel, Austenitic Alloy Steel, and Stainless Steel Tubes
E527 Practice for Numbering Metals and Alloys in the Unified Numbering System (UNS)
SAE Standard:
SAE J 1086 Practice for Numbering Metals and Alloys (UNS)

S32760 Super Duplex Steel Pipe Applications

UNS S32760 is used in the oil and gas industry, on offshore platforms, in heat exchanger, chemical processing equipment, pressure vessels and boilers.

Oil and gas industry equipment,
Offshore platforms, heat exchangers, process and service water systems, fire-fighting systems, injection and ballast water systems,
Chemical process industries, heat exchanger, vessels, and piping,
Desalination plants, high pressure RO-plants and seawater piping,
Mechanical and structural components, high strength, corrosion-resistant parts,
Power industry FGD systems, utility and industrial scrubber systems, absorber towers, ducting, and piping.

General Requirements

Product furnished under this specification shall conform to the applicable requirements of specification A1016/ A1016M, unless otherwise provided herein.

Manufacture

The tubes shall be made by the seamless or welded process with no filler metal added.

Heat Treatment

All tubes shall be furnished in the heat-treated condition in accordance with the procedures shown in Table 2. For seamless tubes, as an alternate to final heat treatment in a continuous furnace or batch-type furnace, immediately follow- ing hot forming while the temperature of the tubes is not less than the specified minimum solution treatment temperature, tubes may be individually quenched in water or rapidly cooled by other means.

Raw Product Analysis

1. An analysis of either one billet or one length of flat-rolled stock or one tube shall be made from each heat. The chemical composition thus determined shall conform to the requirements specified.
2. A product analysis tolerance (see the annex table on Chemical Requirements (Product Analysis Tolerances) in Specification A480/A480M) shall apply. The product analysis tolerance is not applicable to the carbon content for material with a specified maximum carbon of 0.04 % or less.
3. If the original test for product analysis fails, retests of two additional billets, lengths of flat-rolled stock, or tubes shall be made. Both retests for the elements in question shall meet the requirements of this specification; otherwise, all remaining material in the heat shall be rejected or, at the option of the producer, each billet or tube may be individually tested for acceptance. Billets, lengths of flat-rolled stock, or tubes that do not meet the requirements of this specification shall be re- jected.
NOTE 1—For flange and flaring requirements, the term lot applies to all tubes prior to cutting of the same nominal size and wall thickness that are produced from the same heat of steel. When final heat treatment is in a batch-type furnace, a lot shall include only those tubes of the same size and from the same heat that are heat treated in the same furnace charge. When the final heat treatment is in a continuous furnace, or when heat treated condition is obtained directly by quenching after hot forming, the number of tubes of the same size and from the same heat in a lot shall be determined from the size of the tubes as prescribed in Table 3.
NOTE 2—For tension and hardness test requirements, the term lot applies to all tubes prior to cutting, of the same nominal diameter and wall thickness that are produced from the same heat of steel. When final heat treatment is in a batch-type furnace, a lot shall include only those tubes of the same size and the same heat that are heat treated in the same furnace charge. When the final heat treatment is in a continuous furnace, or when heat treated condition is obtained directly by quenching after hot forming, a lot shall include all tubes of the same size and heat, heat treated in the same furnace at the same temperature, time at heat, and furnace speed, or all tubes of the same size and heat, hot formed and quenched in the same production run.

TINSI duplex steel tubes pipes:

TINSI-STEEL company professional supply of Duplex stainless and Super Duplex stainless steel seamless pipes&tubes and welded pipes&tubes (Duplex steel industrial tubes&pipes,Duplex steel BA sanitary tubes&pipes,Duplex steel precision tubes&pipes,Duplex steel capillary) , and a large ready stock about 200tons available in common materials like Duplex stainless 2205 ( UNS32205),2507(UNS32750), Z100(UNS32760).our expert team focusing on pipes/tubes more than 20 years,and start Duplex stainless steel about 5years,firm production and sell control all by self in stainless steel pipes&pipes that could provide competitive prices&quality.

TINSI-STEEL offered Table lists the chemistries and UNS numbers of various common DSS, including some first generation DSS for comparison. Note that UNS S32205 is a “newer version” of UNS S31803 and is produced with higher nitrogen, chromium, and molybdenum contents.

Mechanical Tests Required

Table4.TINSI-STEEL tube test：

PMI test	Positive Material Identification(PMI) chemical composition thus determined shall conform to the requirements .
Dimension & Visual Examination	Measure OD,ID,Wall Thickness,Straightness, Length(inch /mm) and inspection make sure tube surface no cracks and pits
Surface Roughness Test	precision or sanitary tube or some special requirements for surface,surface roughness tester use highly sophisticated inductance sensor approach looking at peaks and valleys,most popular parameter is Ra,plus Rz, Rq, Rt.
Tensile Test	This is probably the most revealing of the mechanical tests that can be performed upon a specimen of pipe or tubular product material. A longitudinal specimen1 of known cross sectional area is taken from the material and gripped at each end, and then pulled apart until fracture occurs.
Flaring Test	This is an alternative to the fl ange test for certain types of pressure tube. A cone is forced into the end of the tube. The end of the tube is expanded by a specifi ed increase in diameter without splits or cracks.The included angle of drift is also specifi ed.
Flattening Test	This is usually applied to tube and involves fl attening a sample of tube between two parallel faces without the tube showing fl aws or cracks.The length of the test piece and degree to which it is to be fl attened (i.e. the distance between the parallel faces)are specifi ed.
Metallographic Inspection	The microstructure of metallic materials directly affects the performance and service life of mechanical parts, metallurgical analysis is an important way to control the intrinsic quality of the mechanical parts.
Hardness Tests(general choose one among)
Brinell Hardness Test.	A standard size hardened steel ball is indented into the surface of material by an applied standard load. The diameter of the impression is measured accurately by microscope and converted to a hardness value using tables.
Vickers Diamond Hardness Test.	This determines hardness by measuring the impression left in material by a diamond pyramid under a standard load. The impression is accurately measured, and its area calculated.The Vickers Hardness Number is calculated by dividing the load (kg) by the area of impression (mm2).
Rockwell Hardness Test.	This determines hardness by measuring the depth to which a diamond cone or hardened steel ball, under specifi c load, penetrates the material. Two loads are used, a minor load (10kgf) and then a major load (100 or 150 kgf), the difference in indentation being used by the machine to determine the Rockwell number.The number increases with increasing hardness and is displayed or printed by the machine. Two scales are most frequently used, a B scale with a 100 kgf load and 1.588mm steel ball, and a C scale with a 150 kgf load and diamond cone. A Rockwell superfi cial hardness machine is used for testing very thin wall thicknesses, the minor load used being 3 kgf and the major load being 15, 30 or 45 kgf. The superfi cial hardness scales used are then 15T, 30T or 45T with a 1.588mm steel ball, or 15N, 30N or 45N with a diamond cone.
Non-destructive Tests (general choose one among)
Hydrostatic Testing.	This is used to test the manufactured items under a pressure equivalent to or greater than pressure to be encountered in service. It involves filling the tube with water, which cannot be compressed, and increasing the pressure inside the tube to that specified
Ultrasonic Testing	This test involves ultrasonic sound waves being aimed, via a coupling medium, at the material to be tested. A proportion are bounced back at the interface but the remainder enter the material and bounce from the internal surface, to the external surface, where a transducer converts them into electrical energy. This is then monitored on a cathode ray tube where results are compared with those from a calibration standard. Any deviations from the standard are visible, thus indicating cracks or internal defects.
Eddy-Current Testing	This involves inducing eddy currents into the material by exciting a coil which surmounts two narrow search coils surrounding the material. Any discontinuities in material are found by comparing the electrical conditions that exist in the two search coils. The fault signals are amplifi ed and can be shown on a cathode ray tube or as an audible signal.

Table.5 Heat Treatment

UNS Designation	Temperature	Quench
S32750	1880-2060 °F [1025-1125°C]	Rapid cooling in air or water

Table6.standards Comparison of ASTM /EN

Standard Item	ASTM A789		ASTM A790		EN 10216-5
Grade	S31803 S32205 S32750		S31803 S32205 S32750		1.4301 1.4307 1.4948 1.4315 1.4401 1.4404 1.4571 1.4541 1.4941 1.4845 1.4449 1.4438 1.4550 1.4912 1.4462 1.4410
Yield Strength (Mpa)	≥450；≥485；≥550		≥450；≥450；≥550		---
Tensile Strength (Mpa)	≥620；≥655；≥800		≥620；≥655；≥800		---
Elongation(%)	≥25；≥25；≥15		≥25；≥25；≥15		---
Hydrostatic Test	The Hydrostatic Test shall be in accordance with ASTM A1016. Could be replaced by ECT.		The Hydrostatic Test shall be in accordance with ASTM A999. Could be replaced by ECT.		The hydrostatic test shall be carried out at a test pressure of 7MPa or at a test pressure calculated using the following formula P=2St/D S=70%Rp0.2
Intergranular Corrosion Test	Usually use Pitting Corrosion Test.		Usually use Pitting Corrosion Test.		EN ISO 3651-2 (Optional)
Eddy Current Test	Could be replaced by HT.		Could be replaced by HT.		EN 10246-3
O.D. Tolerance (mm)	O.D.	O.D.Tolerance	O.D.	O.D.Tolerance	O.D. Tolerance Class
	D<12.7	+/-0.13	10.3≤D≤48.3	+0.40/-0.80	D3	+/-0.75% or +/-0.3mm
	12.7≤D<38.1	+/-0.13	48.3	+0.80/-0.80
					whichever is the greater
	38.1≤D<88.9	+/-0.25	114.3	+1.60/-0.80	D4	+/-0.5% or +/-0.1mm
	88.9≤D<139.7	+/-0.38	219.1	+2.40/-0.80
					whichever is the greater
W.T. Tolerance (mm)	O.D.	W.T.Tolerance	O.D.	W.T.Tolerance