ASTM B163 N02200 N02201 N04400 N06600 N06601 N06690 N08800 N08810 N08811 N08825 N08020 N06025

Guanyu Tube is specialized manufacturer of ASTM B163 N02200 N02201 N04400 N06600 N06601 N06690 N08800 N08810 N08811 N08825 N08020 N06025 U Bend Nickel Alloy Tubes.

U Bend Nickel Alloy Tube are manufactured in our plant as per the customer requirements. Solution annealing after bend will be process to lower the risidual stress, and followed by hydrostatic testing and dye penetrant testing if required.

Nickel Alloy U Bend Tubes are widely used in heat-exchanger systems. Heat exchanger equipment on the basis of stainless steel U-tube is essential in strategically important and critical fields nuclear and petrochemical machine building.

Nickel Alloy U bend Tubes Application

U tube heat exchangers designed for high temperature applications, especially steam condensing or hot oil systems. Application: Boiler, heat exchanger , super heater, feedwater heater, condenser. Thïs model is selected when differential expansion makes a fixed tube sheet exchanger unsuitable and when conditions preclude a floating head type (HPF) selection.

Corrosion resistant Nickel Alloy U bend Tubes

Nickel’s high degree of corrosion resistance is due to the fact that it is a relatively noble metal within the galvanic electrochemical series of metals. Adding chrome, molybdenum, copper and other elements forms alloys with even higher resistance to oxidation and corrosion which makes it possible to use them in a wider range of applications. Seamless tubes and pipes made of corrosion resistant nickel-based alloys are the first choice for basic industry manufacturers due to their excellent resistance to various acids (sulphuric acid, hydrochloric acid, phosphoric acid) and alkaline solutions.

High temperature Nickel Alloy U bend Tubes

Based on an austenitic structure, high temperature, high strength nickel-based alloys allow further increasing of specific alloying elements, such as chrome, molybdenum, tungsten, titanium, aluminium, niobium, etc. This leads to a very low iron concentration enabling the material to be employed within applications up to 1,100°C (2,012°F) in aggressive atmospheres. Available upon special request are titanium tubes for heat exchangers and bimetallic tubes for strippers in urea application.Surface condition Finished U Bend Tube shall be free of scale, without scratches after bending

Nickel Alloy Tubing Grade Comparion Chart

China GB	Unified Digital Code	ASTM	UNS Code	EN Code	Company Commercial Grade
Ni68Cu28Fe	–	400	N04400	2.4360	Monel 400(SMC)
–	–	K500	N05500	2.4375	Monel K500(SMC)
1Cr15Ni75Fe	NS3102	600	N06600	2.4816	Inconel 600(SMC)
1Cr23Ni60Fe13Al	NS3103	601	N06601	2.4851	Inconel 601(SMC)
20Cr25Ni60Fe10AlY	–	602	N06025	2.4633	Nicrofer 6025HT(VDM)
–	–	617	N06617	2.4663	Inconel 617(SMC)
0Cr20Ni65Mo10Nb4	NS3306	625	N06625	2.4856	Inconel 625(SMC)
0Cr30Ni60Fe10	NS3105	690	N06690	2.4642	Inconel 690(SMC)
0Cr20Ni32AlTi	NS1101	800	N08800	1.4876	Incoloy 800(SMC)
1Cr20Ni32AlTi	NS1102	800H	N08810	1.4958	Incoloy 800H(SMC)
0Cr21Ni42Mo3Cu2Ti	NS1402	825	N08825	2.4858	Incoloy 825(SMC)
00Cr15Ni60Mo16W5Fe5	NS3304	C276	N10276	2.4819	Hastelloy C276(Haynes)
00Cr17Ni57Mo13W3	NS3308	C22	N06022	2.4602	Hastelloy C22(Haynes)
–	NS3405	C2000	N06200	2.4675	Hastelloy C2000(Haynes)
00Ni70Mo28	NS3202	B2	N10665	2.4617	Hastelloy B2(Haynes)
00Mo28Ni65Fe1.5Cr1.5	NS3203	B3	N10675	2.46	Hastelloy B3(Haynes)
0Cr20Ni35Mo3Cu3Nb	NS1403	alloy 20	N08020	2.466	Incoloy 020(SMC)
00Cr27Ni31Mo3Cu	–	alloy 28	N08028	1.4563	Sanicro 28
00Cr27Ni31Mo7CuN	NS1404	alloy 31	N08031	1.4562	Nicrofer 3127hMo(VDM)
00Cr22Ni48Mo7Cu2Nb	NS3403	G3	N06985	2.4619	Hastelloy G3(Haynes)
00Cr30Ni43Mo5.5W2.5Cu2Nb	NS3404	G30	N06030	2.4603	Hastelloy G30(Haynes)
0Cr33Ni55Mo8	–	G35	N06035	2.4643	Hastelloy G35(Haynes)
0Cr15Ni70Ti3AlNb	GH4145	X750	N07750	2.4669	Inconel X750(SMC)

Dimensional tolerances U Bend Tube acc. to TEMA R.C.B.

9.1 Permissible variations from the speciﬁed outside diameter shall not exceed ±0.004 in. [0.10 mm] for tubing under 1.0 in. [25.4 mm] outside diameter nor ±0.006 in.[0.15 mm] for tubing 1.0 in. [25.4 mm] to 1.25 in.[31.7 mm] inclusive. These tolerances do not apply to the bent portion of the U-tubes. At the bent portion of a U-tube for R p 2 D or greater neither the major nor minor diameter of tube shall deviate from nominal by more than 10%. If 11⁄2 D is speciﬁed, tolerances could be greater.

9.2 Permissible variations from the speciﬁed minimum wall thickness shall not exceed +20% or −0. The wall thickness of the tube in U-bent section shall be not less than value determined by: tf p T(2R)/(2R+D)
Where: tf p wall thickness after bending, in. [mm],
T p speciﬁed minimum tube wall thickness, in. [mm],
R p centerline bend radius, in. [mm], and
D p nominal outside tube diameter, in. [mm].

1) U Bend Pipe Length of straight part -0/+5 mm
Flattening (also called “ovality”) at the bend shall not exceed 10% of the nominal tube outside diameter.
Wall thickness in bending part acc. to TEMA R.C.B 2.31

2) U Bend Tube Minimum tube wall thickness in the bend part (T min)T(min) ≥ (SW × (2×R + D))/( 2× (R+D)
where: SW is smallest wall thickness
D Nominal outside diameter
R radius

3) U Bend Tube Radius tolerance
1) for R 100 mm +/- 3 mm
2) for R ≥ 100 mm +/- 5 mm

4). U bend Pipe Straightness tolerance max. 1,5 mm per 1 m
U Bend Tube ends: plain, vertically cut to the tube axis

U Bend Tube OD in mm can be bent upon agreement: 15.88 16.0 17.0 18.0 19.05 20.0 21.3 25.4 26.7 31.75 32.0 38.1mm

U bend Tube Initial Length
Maximum lengths of 27000mm can be supplied on request

U bend Pipe Bending radius
Minimum: 1.5×OD
Maximum: 1500 mm

The dimensions for heat exchanger tube in special grades may differ from the above,please contact us.

Our U Bend Tube Tube-bending production line, installed at 2007, will allow to produce U-tubes as per specification:

1. ASTM A688/A688M Specification for Seamless and Welded Austenitic Stainless Steel Feedwater Heater Tubes
2. ASTM A556/A556M Standard Specification for Seamless Cold-Drawn Carbon Steel Feedwater Heater Tubes
3.U Bend Tube for Heat Exchanger Specification

4. ASTM B163 Standard Specification for Seamless Nickel and Nickel Alloy Condenser and Heat-Exchanger Tubes

Nickel Alloy Tube Specifications：

ASTM B111		Standard Speciﬁcation for Copper and Copper-Alloy Seamless Condenser Tubes and Ferrule Stock
ASTM B161		Standard Specification for Nickel Seamless Pipe and Tube
ASTM B163		Standard Specification for Seamless Nickel and Nickel Alloy Condenser and Heat-Exchanger Tubes
ASTM B165		Standard Specification for Nickel-Copper Alloy (UNS N04400)* Seamless Pipe and Tube
ASTM B167		Standard Specification for Nickel-Chromium-Iron Alloys, Nickel-Chromium-Cobalt-Molybdenum Alloy (UNS N06617),and Nickel-Iron-Chromium-Tungsten Alloy (UNS N06674) Seamless Pipe and Tube
ASTM B395		Standard Specification for U-Bend Seamless Copper and Copper Alloy Heat Exchanger and Condenser Tubes
ASTM B407		Standard Specification for Nickel-Iron-Chromium Alloy Seamless Pipe and Tube
ASTM B423		Standard Specification for Nickel-Chromium-Molybdenum-Columbium Alloys (UNS N06625 and UNS N06852) and Nickel-Chromium-Molybdenum-Silicon Alloy (UNS N06219) Pipe and Tube
ASTM B444		Standard Specification for Nickel-Chromium-Molybdenum-Columbium Alloys (UNS N06625 and UNS N06852) and Nickel-Chromium-Molybdenum-Silicon Alloy (UNS N06219) Pipe and Tube
ASTM B622		Standard Specification for Seamless Nickel and Nickel-Cobalt Alloy Pipe and Tube
ASTM B668		Standard Specification for UNS N08028 and N08029 Seamless Pipe and Tube
ASTM B677		Standard Specification for UNS N08925, UNS N08354, and UNS N08926 Seamless Pipe and Tube
ASME SB690		Standard Specification for Iron-Nickel-Chromium-Molybdenum Alloys (UNS N08366 and UNS N08367) Seamless Pipe and Tube
ASTM B705		Standard Specification for Nickel-Alloy (UNS N06625, N06219 and N08825) Welded Pipe
ASTM B729		Standard Specification for seamless UNS N08020, UNS N08026, and UNS N08024 nickel alloy pipe and Tube