Nyob rau hauv qhov kub thiab txias, lub zog tensile thiab hardness ntawm cov ntaub ntawv nce, plasticity thiab toughness txo, thiab muaj ntau yam sib txawv degrees ntawm low-temperature brittleness, heev cuam tshuam rau ib txwm ua hauj lwm ntawm lub valve. Yog li ntawd, nyob rau hauv kev xaiv ntawm cov ntaub ntawv rau low-temperature valve Cheebtsam, cov nram qab no cov ntsiab lus yuav tsum tau muab sau tseg:
(1) Qhov tsawg kawg nkaus ua haujlwm kub ntawm lub valve;
(2) Cov khoom siv kho tshuab tsim nyog los xyuas kom meej tias cov khoom tsis poob lawv lub peev xwm ua haujlwm ntawm qhov kub thiab txias, tshwj xeeb tshaj yog kub-kub cuam tshuam toughness, txheeb ze elongation, thiab lub koom haum stability;
(3) Xyuas kom meej tias cov khoom ua tau raws li qhov kev sib raug zoo rau kev ua haujlwm tsis tshua muaj kub nruab nrab tawg-pov thawj,
(4) Ua kom ntseeg tau qhov tsim nyog thermal lub cev ntawm cov khoom, suav nrog thermal conductivity, txias shrinkage kev ua tau zoo, thiab lwm yam;
(5) Xyuas kom meej tias cov khoom tsim nyog hnav tsis kam nyob rau hauv qhov kub thiab txias tsis muaj roj lubrication;
(6) Xyuas kom meej tias cov khoom muaj qhov tsim nyog corrosion kuj;
(7) Thaum siv vuam, vuam kev ua tau zoo ntawm cov khoom yuav tsum tau txiav txim siab.
1. Kev xaiv cov khoom siv rau lub cev kub qis, lub hau npog, lub rooj zaum valve, qhib thiab kaw qhov chaw, thiab lwm yam
Ferritic stainless hlau tuaj yeem siv tau thaum qhov kub siab tshaj -100 degree, austenitic stainless hlau tuaj yeem siv thaum kub qis dua -100 degree, thiab tooj liab alloy lossis aluminium alloy tuaj yeem siv rau qhov tsis tshua muaj siab thiab me me. txoj kab uas hla li qub.
2. Kev xaiv cov khoom siv hluav taws xob qis qis
Ua los ntawm austenitic stainless thiab acid resistant steel, kev kho cua sov tsim nyog yuav tsum tau txhim kho tensile zog, thiab tawv chromium plating (txheej thickness 0.04-0.06mm) los yog nitriding kev kho mob yuav tsum tau nqa tawm los txhim kho nto tawv.
3. Kev xaiv cov khoom siv fastener rau cov cua kub qis
Thaum qhov kub thiab txias siab tshaj -100 degree, cov khoom siv ntsia liaj qhov rooj yog ua los ntawm cov hlau alloy xws li Ni thiab Cr Mo, uas yuav tsum tau txais kev kho cua sov kom tsim nyog los tiv thaiv xov tom; Thaum qhov kub thiab txias qis -100 degree, austenitic stainless hlau tuaj yeem siv los ua cov khoom siv ntsia hlau. Cov khoom siv txiv ntoo feem ntau yog Mo steel lossis Ni steel, thiab cov xov nto yog coated nrog disulfide key.
4. Kev xaiv cov khoom siv gasket rau cov khoom siv qis qis
Thaum qhov kev khiav hauj lwm kub siab tshaj -196 degree thiab lub siab tshaj plaws kev khiav hauj lwm siab nyob rau hauv qis kub yog 3MPa, asbestos roj hmab los ntawm ntev fiber ntau tus kheej asbestos yuav siv tau; Thaum qhov kev khiav hauj lwm kub siab tshaj -196 degree thiab lub siab tshaj plaws kev khiav hauj lwm siab nyob rau hauv qis kub yog 5MPa, stainless hlau asbestos mob gaskets, stainless hlau PTFE lub qhov txhab gaskets, los yog stainless hlau nthuav graphite mob gaskets yuav siv tau.
Nws yuav tsum tau hais tias tag nrho cov khoom siv uas tsis muaj qhov kub thiab txias yuav tsum tau txais kev kho mob cryogenic ua ntej precision machining kom txo tau qhov shrinkage deformation ntawm qis-kub li qub nyob rau hauv qis-kub.
