U tubes

U-Tubes

Tubes for heat exchangers are resistant to high temperature and pressure and have suitable properties for bending. The tubes allow transfer of energy from one carrier to another. The product  is manufactured as cold-drawn, but it is possible to hot roll.

The choice of material type for the tube affects the entire heat exchanger. In addition, it is worth noting the type of fluids, their chemical properties and other parameters of the exchanger's operation. When checking these properties, the constructors take into account the relevant specifications, e.g. American ASTM A213 / SA 213, European EN 10216-5: 2004

U-tubes – tests

In order to ensure the proper quality U-bends are subjected to the following tests: tightness test of water under pressure, tightness test by immersion, test under pulsating pressure, magnetoscopic test.

In addition, tubes of this type are controlled by checking the ovality of the equal and bent parts, the distance between bent parts and equal U-bending, the straightness of the bent part, visual control of U-bends, deviations from the bending plane.

U-type bends are heat treated using Joul's law, which involves the release of heat during the flow of electric current.

 

Heat exchangers

Heat exchangers are devices that serve to transfer heat energy through one agent to another or to many agents. Exchangers can be divided into: diaphragm (two devices, heat exchange substances combine with each other during heat transfer). The driving force of heat transfer is the temperature difference between heating and heating factors.

This group includes a large group of devices that have different parameters related to the flow method and different applications.

Frequently used devices of this type include a shell-and-tube heat exchanger made of three basic elements: mantle, straight tubes or welded u-tubes and compartments/partitions. This construction creates two spaces: tubular, inter-wall. The exchanger is often used and belongs to the common mechanisms used in industry.

The versatility of applications includes:

- flexibility of introducing various systems (counter-current, co-current, etc.)

- suitability for the use of various elements: tubes, flanges, gaskets,

- can be used in a wide range of pressures and temperatures,

There are also heat exchangers available on the market - a tube in a tube. However, their efficiency is low because the surface of the mantle is larger than the heat exchange surface, and this generates a large loss of heat.

 

Heat exchanger applications:

The device has a wide range of applications and it is used in several industries: power engineering, chemical industry and in construction in the field of heating buildings, utility water. Most often, cold drawn tubes are chosen in these situations.

 

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Stainless steel/Acid-proof stainless steel/Heat resistant stainless steel
EN steel numberGradeDINAISI / SAE / ASTM
1.40000H13X6Cr13403/410S
1.40020H13JX6CrAl13405
1.40051H13X12CrS13416
1.40061H13X12Cr13410
1.4016H17X6Cr17430
1.40212H13X20Cr13420
1.40283H13X30Cr13-
1.40344H13X46Cr13-
1.40572H17N2X17CrNi16-2431
1.4104-X14CrMoS17430F
1.4112-X90CrMoV18440B
1.41223H17MX39CrMo17-1-
1.4125H18X105CrMo17440C
1.43010H18N9X5CrNi18-10304
1.4305-X10CrNiS18-9303
1.430600H18N10X2CrNi19-11304L
1.43101H18N9X12CrNi18-8301
1.4313-X3CrNiMo13-4A182(F6NM)
1.44010H17N12M2TX5CrNiMo17-12-2316
1.440400H17N14M2X2CrNiMo17-13-2316L
1.443500H17N14M2X2CrNiMo18-14-3316L
1.443600H17N14M2X5CrNiMo17-13-3316
1.443800H17N14M2X2CrNiMo18-15-4317L
1.4439-X2CrNiMoN17-13-5316LMN
1.4460DUPLEXX3CrNiMoN27-5-2329
1.446200H22N24M4TCuX2CrNiMoN22-5-3S31803/A182(F51)
1.45100H17TX6CrTi17430Ti/439
1.45390H22N24M4TCuX1NiCrMoCu25-20-5NO8904
1.45411H18N9TX6CrNiTi18-10321
1.45500H18N12NbX6CrNiNb18-10347
1.4571H17N13M2TX6CrNiMoTi17-12-2316Ti
1.4712H6S2X10CrSi6-
1.4713H6S2X10CrAlSi7-
1.4718H9S2X45CrSi9-3HNV3
1.4724H13JSX10CrAl13-
1.4731H10S2MX40CrSiMo10-2-
1.4742H18JSX10CrAl18-
1.4749-X18CrN28-
1.4762H24JSX10CrAl24446
1.4821H26N4X15CrNiSi25-4-
1.4828H20N12S2X15CrNiSi20-12309
1.4833H23N13X12CrNi23-12-
1.4841H25N20S2X15CrNiSi25-20310
1.4843H23N18--
1.4845H25N21X12CrNiSi25-21310S
1.4864H16N36S2X12NiCrSi36-16330
1.4876-X10NiCrAlTi32-21-
1.4878-X10CrNiTi18-10321
Alloy structural steel
EN steel numberGradeDINAISI / SAE / ASTM
1.046715G15Mn3-
1.048219G219Mn5-
1.064260G60Mn3/C61-
1.090350S2--
1.090455S255Si7-
1.117030G228Mn6-
1.492320H12MIFX20CrMoV12-1-
1.512235SG37MnSi5-
1.541516M16Mo3-
1.575212HN3A15NiCr13-
1.591915HN15CrNi63115
1.592018H2N218CrNi8-
1.651136HNM36CrNiMo44340/9840
1.652320HNMA21NiCrMo28620
1.654637HGNM40NiCrMo2-28740
1.658030H2N2A30CrNiMo8-
1.658234HNM34CrNiMo64337
1.658717HGM17CrNiMo6-
1.662320HNM21NiCrMo28620
1.701515H15Cr3-
1.703030H28Cr45130
1.7033-34Cr4-
1.703438HA37Cr45135
1.703540H41Cr45140
1.713116HG16MnCr55115
1.714720HG20MnCr55120
1.721825HM25CrMo44130
1.722035HM34CrMo44135
1.722540HM42CrMo44140
1.722850H50CrMo4-
1.726218HGM18CrMo4-
1.733515HM13CrMo4-4A182/F11
1.7362H5M12CrMo19-5-
1.738010H2M10CrMo9-10A182/F22
1.770730H2MF30CrMoV9-
1.771513HMF14MoV6-3-
1.807021HMF21CrMoV5-11-
1.815950HF51CrV46150
1.850938HMJ41CrAlMo7-
1.855033H2NMJ34CrAlNi7-
Carbon structural steel
EN steel numberGradeDINAISI / SAE / ASTM
1.0035St0SSt33A570
1.0037St3SSt37-2/S235JRA573
1.0038St3SRSt37-2/S235JR-
1.0050St5/Mst5St50-2/E295A572
1.0060St6/Mst6St60-2/E335A572
1.0070St7/Mst7St70-2/E360-
1.0116St3WSt37-3/S235J2G3A573
1.0144St4SWSt44-3/S275J2G3A573
1.0179St4SVSt44-2Cu3/S275JRCuA570
1.030110C101010
1.040115C151015
1.040220C221020
1.040625C251025
1.050135C351035
1.050345C451045
1.051140C401040
1.052830C30-
1.053555C551055
1.056218G2AStE355/P355NA588
1.056518G2AWStE355/P35NH-
1.056618G2ATStE355/P355NL1-
1.057018G2AASt52-3/S355J2G3-
1.060160C601060
1.060365C671065
1.114115Ck15-
1.1151-Ck22-
1.118640Ck40-
1.119145Ck45-
1.890518G2AVStE460/P460N2-
Tool steel
EN steel numberGradeDINAISI / SAE / ASTM
1.1525N8ECT80(W1-8A)
1.1663N12ECT120W1-111/2A
1.1820N5C55W-
1.1830N9ECT90W1-81/2A
1.2080NC11X210Cr12D3
1.2343WCLX38CrMoV5-1H11
1.2344WCLVX40CrMoV5-1H13
1.2363NCLVX100CrMoV5-1A2
1.2365WLVX32CrMoV3-3H10
1.2367-X38CrMoV5-3-
1.2379NC11LVX155CrVMo12-1D2
1.2414NW1120W4F1
1.2419NWC105WCr6-
1.2436NC11X210CrW12-
1.2542NZ245WCrV8S1
1.2550NZ360WCrV7(S1)
1.2581WWVX30WCrV9-3-
1.2601NC11LVX165CrMoV12-
1.2713WNL55NiCrMoV6(L6)
1.2714WNLV56NiCrMoV7-
1.2721NPW50NiCr13-
1.2842NMV90MnCrV8O2
1.3207SK10VHS10-4-3-10-
1.3243SK5MS6-5-2-5M35
1.3247SK8MS2-10-1-8M42
1.3343SW7MHS6-5-2M2
1.3355SW18HS18-0-1T1
1.3505ŁH15100Cr652100
Tool steel
EN steel numberGradeISO / AISI / DIN
1.1545-C105U
1.1730-C45U
1.2080NC11D3
1.2210-L2/115CrV3
1.2343WCLH11
1.2344WCLVH13
1.2363NCLVA2
1.2365WLVH10
1.2367-X38CrMoV5-3
1.2379NC11LVD2
1.2436NC11X210CrW12
1.2510NMWV100MnCrW4
1.2550NZ360WCrV7
1.2601NC11LVX165CrMoV12
1.2721NPW50NiCr13
1.2842NMVO2/90MnCrV8
1.2885--
1.3207SK10VHS10-4-3-10
1.3243SK5MM35/S6-5-2-5
1.3247SK8MM42/S2-10-1-8
1.3343SW7MM2/S6-5-2
1.3344-M3/S6-5-3
1.3355SW18T1/HS18-0-1
Tool steel
EN steel numberGradeISO / AISI / DIN
1.2344WCLVH13/X40CrMoV5-1
1.2344-H13/X40CrMoV5-1
1.2358--
1.2363NCLVA2/X100CrMoV5-1
1.2379NC11LVD2/X155CrVMo12-1
1.2436NC11X210CrW12
1.2510NMWV100MnCrW4
1.2631--
1.2714WNL156NiCrMoV7
1.3344-M3/S6-5-3
Special steel
EN steel numberGradeASTM
1.4562Alloy31B564
1.4864AlloyDSB511
1.4876Alloy800B564
1.4958Alloy800HB564
1.4959Alloy800HTB564
2.0830CuNi25-
2.0862CuNi5FeB111
2.0872CuNi10Fe1MnB122, B171
2.0882CuNi30Fe1MnB122, B171
2.4066Alloy200B564
2.4068Alloy201B160
2.4360Alloy400B564
2.4375AlloyK500-
2.4600AlloyB3B564
2.4602AlloyC22B564
2.4605Alloy59B564
2.4610AlloyC4B564
2.4617AlloyB2B335
2.4642Alloy690B166
2.4650AlloyC263-
2.4660Alloy20B462
2.4663Alloy617B564
2.4668Alloy718B637
2.4669AlloyX750B637
2.4816Alloy600B564
2.4819AlloyC-276B564
2.4851Alloy601B166
2.4856Alloy625B564
2.4858Alloy825B564
2.4951Alloy75-
2.4952Alloy80AB637
2.4969Alloy90-
Titanium alloys
EN steel numberGradeASTM
3.7024Titan Grade 1B381
3.7035Titan Grade 2B381
3.7105Titan Grade 12B381
3.7164Titan Grade 5 (LF)-
3.7165Titan Grade 5B381
3.7235Titan Grade 7B381
Titanium alloys
EN steel numberGradeEN steel numberDIN
1.0037St37-2G1.0506WStE315
1.0038RSt.37-21.0508TStE315
1.0050St50-21.0535C55
1.0060St60-2G1.0562StE355
1.0116St37-3G1.0565WStE355
1.0301C101.0566TStE355
1.0401C151.0566P355NL1
1.0402C221.0570St52-3
1.0425P265GH1.0601C60
1.0432C211.1101TTST35
1.0437P310NB1.113320Mn5
1.0460C22G21.1141Ck15
1.0481P295GH1.1151Ck22
1.048219Mn51.117330Mn5
1.0486StE2851.1181Ck35
1.0487WStE2851.1191Ck45
1.0488TStE2851.1193Cf45
1.0501C351.1213Cf53
1.0503C451.1221Ck60
1.0505StE315
Tool steel
EN steel numberDINEN steel numberDIN
1.2063145Cr61.2436X210CrW12
1.2067102Cr61.2510100MnCrW4
1.2080X210Cr121.255060WCrV7
1.216221MnCr51.2601X165CrMoV12
1.231240CrMnMoS8-61.271355NiCrMoV6
1.2316X36CrMo171.271456NiCrMoV7
1.2343X38CrMoV511.271855NiCr10
1.2344X40CrMoV5-11.273515NiCr14
1.2363X100CrMoV5-11.2764X19NiCrMo4
1.2365X32CrMoV3 31.2767X45NiCrMo4
1.2367X38CrMoV5-31.282660MnSiCr4
1.2379X155CrMoV12-11.284290MnCrV8
1.2419105WCr6
Spring steel
DINPN
1.815951CrV450HF
1.5026
others