ASTM A335 P9, P11, T22, T91

* Astm A335 ** yog tus qauv tshwj xeeb rau cov yeeb nkab sib xyaw ua ke {} Cov yeeb nkab steel tsim rau high- kub kev pab. Feem ntau xa mus rau "chrome - moly" cov xaim hluav taws xob, thiab cov roj ntsha uas muaj zog thiab xeb ntawm qhov kub thiab txias yog qhov tseem ceeb.

Cov alphanumeric tsim (P9, P11, thiab lwm yam) txhais tau tias muaj tshuaj lom neeg tshwj xeeb thiab yog li cov yam ntxwv sib txawv thiab kev ua tau zoo. Tus "P" Prefix qhia cov khoom yog npaj rau kev siab - muaj cov hom phiaj.

** Cov yam ntxwv xws li: **
* ** High {{- kub lub zog: ** Cov alloys muaj zog ntau dua li cov roj carbon hlau nyob ntau dua li 1000℃f (538 degree).
* ** Oxidation & Corrosion Kuj: ** Cov ntaub ntawv Chromium cov ntaub ntawv ruaj khov, kev tawm tsam thiab kev cuam tshuam hauv cov chaw muaj kev xeb.
* ** Creep Intionance: ** Lawv tau tsim tshwj xeeb los tiv thaiv kev tiv thaiv cov ntaub ntawv ntawm kev ntxhov siab ntau dua ntawm kev ntxhov siab hauv lub rhaub thiab cov twj tso cai.

Ntawm no yog ib tug ze saib ntawm cov qib tshwj xeeb:

** ASTM A335 P9 **
P9 yog chromium - molybdenum alloy steel nrog ib tus nominal muaj pes tsawg tus ntawm ** 9% chromium thiab 1% molybdenum **. Qhov ntau dua cov ntsiab lus chromium ntau dua piv rau P11 thiab T22 muab nws lub zog ntau dua ntawm qhov kub thiab txias txog 1200℃f (650 degree). Nws yog feem ntau siv los ua tus ua tiav kom qis- qib ib alloys hauv lub zog boilers thiab rau siab {} kub raj hauv recineries hauv kev ua kom txias.

** ASTM A335 P11 **
P11 yog ib qho cligium chromium - molybdenum hlau nrog ib tus nominal muaj pes tsawg tus ntawm ** 1.25% chromium thiab 0.5% molybdenum **. Nws muaj qhov sib npaug zoo ntawm lub zog, weldability, thiab tus nqi- ua hauj lwm zoo rau kev siv qhov kub thiab txias. Nws yog feem ntau siv nyob rau hauv cov khoom lag luam hluav taws xob thiab cov txheej txheem kev lag luam rau cov kev pab cuam nrog cov roj cua, thiab cov roj hauv cov hlau ua kom tiav 1000℃rau 540 degree).

** ASTM A335 T22 / P22 / P22 **
(Ceeb Toom: T22 thiab P22 thiab P22 thiab P22 yog qhov tseem ceeb zoo ib yam nyob rau hauv muaj kev sib xyaw;
T22 / P22 / P22 yog siv dav dav siv nrog nominal muaj pes tsawg tus ntawm ** 2.25% chromium thiab 1% molybdenum **. Cov qib no muaj lub zog ua kom muaj zog thiab oxidation tsis kam piv rau cov khoom siv hluav taws xob roj av, thiab cov hlab ntsha kub siab rau 1100℃f (595 degree).

** ASTM A335 T91 / P91 **
T91 / P91 sawv cev rau txoj kev nce qib tseem ceeb hauv qhov siab - muaj zog ferritic alloys. Nws nominal muaj pes tsawg leeg yog ** 9% chromium thiab 1% molybdenum **, tab sis nws yog txhim kho nrog ntxiv ntawm ** Vanadium (Niobium (NB), thiab nitrogen (n) **. Qhov no ua tib zoo ua kom sov rau nws kom sov {{-}} nrhiav martensitic microstructure, ua rau muaj kev tshwj xeeb:
* ** Lub zog ua kom muaj zog: ** Nws tuaj yeem ua haujlwm ntawm kev ntxhov siab ntau dua thiab qhov kub (txog 1300℃F / 700 Degree) zoo li P22, tso cai rau cov kav dej nyias thiab txhim kho kev ua tau zoo.
* ** THERMAL Foob Ua Yeeb Yam: ** Nws ua tau zoo nyob rau hauv lub ntsuas kub thiab txias.
Vim nws cov khoom zoo tshaj, T91 / P91 yog cov khoom siv tseem ceeb rau cov kab hluav taws xob siab rau cov kab hluav taws xob zoo nkauj, suav nrog cov kav dej loj thiab cov kav dej loj.

Hauv cov ntsiab lus, cov qib A335 qib ua ib tse neeg cov khoom tseem ceeb ua rau muaj kev nyab xeeb thiab cov haujlwm hnyav tshaj plaws. Kev xaiv P9, P11, lossis T22, lossis T22, lossis T91 nyob ntawm qhov kev pabcuam kub tshwj xeeb, siab, corrosion yuav tsum, thiab kev xav txog kev lag luam ntawm txoj haujlwm.