### 1. Cov khoom siv ntawm ASTM A334 yog dab tsi?
ASTM A334 yog tus qauv qhia tshwj xeeb rau ** seamless thiab welded carbon thiab alloy - steel tubs ** npaj rau kev siv qis - kev pabcuam kub. Cov yam ntxwv tseem ceeb ntawm cov raj no yog tias lawv tau tsim los tswj kom muaj zog thiab tiv thaiv kev tawg ntawm qhov kub thiab txias hauv qab ib puag ncig, feem ntau nqes mus rau -50℃F (-45 degree) lossis qis dua, nyob ntawm qib tshwj xeeb. Cov ntaub ntawv npog los ntawm qhov kev qhia tshwj xeeb no suav nrog ntau qib ntawm carbon steel thiab hlau alloy, tag nrho cov uas yuav tsum tau muaj kev cuam tshuam los ntawm kev kuaj xyuas lawv cov khoom kub qis.
### 2. 304 stainless hlau yeeb nkab yog dab tsi?
304 stainless hlau yeeb nkab yog ib cov yeeb nkab ua los ntawm **Austenitic Chromium-Nickel stainless hlau **, uas yog cov feem ntau siv stainless hlau qib. Nws thawj cov tshuaj muaj pes tsawg leeg yog kwv yees li 18% Chromium thiab 8% Nickel. Qhov no muaj pes tsawg leeg muab hom 304 zoo heev corrosion kuj, zoo formability, thiab weldability. Nws yog siv rau hauv ntau yam kev siv, suav nrog cov khoom siv ua zaub mov, cov thawv ntim tshuaj, cov kav dej, cov khoom siv hluav taws xob, thiab cov khoom vaj tsev, tshwj xeeb tshaj yog rau cov cheeb tsam uas tsis muaj chlorides lossis lwm yam tshuaj lom neeg.
### 3. Cov khoom siv twg yog SA 334 Gr.1?
SA 334 Gr.1 yog ib qib tshwj xeeb hauv ASME SA 334 specification (uas zoo ib yam rau ASTM A334). Nws yog ** carbon steel ** raj tsim los rau qis - kev pabcuam kub. Nws cov tshuaj muaj pes tsawg leeg feem ntau yog hlau nrog kev tswj hwm ntawm carbon, manganese, phosphorus, thiab sulfur. Qib 1 yog qhov tshwj xeeb ua cua sov- kho thiab muaj kev cuam tshuam- kuaj xyuas kom ntseeg tau tias nws muaj qhov toughness txaus rau kev siv ntawm qhov kub qis li **-50℃F (-45 degree)**. Nws yog feem ntau siv hauv cov kav dej kub qis, cov khoom siv hluav taws xob, thiab lwm yam khoom siv ua haujlwm hauv qhov chaw txias.
### 4. ASTM A335 khoom specification yog dab tsi?
ASTM A335 yog tus qauv tshwj xeeb rau ** seamless ferritic alloy - steel yeeb nkab ** npaj rau siab - kev pabcuam kub. Cov yeeb nkab no yog tsim los siv rau hauv cov chaw tsim hluav taws xob, refineries, thiab lwm qhov chaw muaj kev lag luam uas muaj kev kub siab thiab kub siab, xws li hauv superheater thiab tshav kub exchanger daim ntawv thov. Ntau qib nyob rau hauv A335 (xws li, P5, P9, P11, P22, P91) yog cov hlau alloy uas muaj cov ntsiab lus xws li chromium thiab molybdenum kom muaj zog ntxiv, tiv thaiv oxidation (scaling), thiab creep lub zog ntawm qhov kub thiab txias.
### 5. ASTM A 325 qib yog dab tsi?
ASTM A325 yog tus qauv tshwj xeeb rau ** siab- lub zog hnyav hex qauv bolts **, kuj hu ua A325 bolts. Cov no yog tsim los ntawm ** nruab nrab carbon steel ** thiab yog cua sov- kho kom ua tau siab tensile thiab yield zog. Lawv tau tsim tshwj xeeb rau kev sib txuas ntawm cov qauv hlau, xws li hauv cov tsev steel thiab cov txuas hniav, uas lawv tau siv los txuas cov tswv cuab ntawm cov qauv. "qib" hauv A325 feem ntau yog hais txog nws cov khoom siv kho tshuab (xws li lub zog tensile ntawm 150,000 psi yam tsawg kawg nkaus), thiab nws muaj nyob rau hauv peb hom (Hom 1, 2, thiab 3) nrog kev hloov pauv hauv chemistry thiab kev ua tau zoo rau cov xwm txheej sib txawv.
