ASTM A662 Klas C pou plak veso presyon

ASTM A662 Grade C is a carbon-manganese-silicon steel plate specifically designed for welded pressure vessels, particularly those operating in moderate and lower temperature service, where improved low-temperature notch toughness is crucial. This steel is characterized by its chemical composition and mechanical properties, including specific tensile strength, yield strength, and elongation requirements.

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Karakteristik teknik

A662 Klas C konpozisyon chimik

A662 Klas C konpozisyon chimik
Egalize	Eleman max la (%)
Egalize	C	Mn	P	S	Si
A662 Klas C	0.24	0.92-1.72	0.035	0.035	0.13-0.55

A662 Klas C pwopriyete mekanik

Egalize	A662 Klas C pwopriyete mekanik
Egalize	Epesè	Rekòlt	Raman	Elongasyon
A662 Klas C	mm	Min MPA	MPA	Min
	200	295	485-620	18
	50	295	485-620	22

Lòt kondisyon

UT (egzamen ultrasons), AR (tankou cho woule sèlman), TMCP (tèmik pwosesis kontwòl mekanik), N (normalized), Q+T (janm pase ak apeze), z tès direksyon (Z15, Z25, Z35), Charpy V-Notch tès enpak, tès la twazyèm pati (tankou SGS tès), KOU

Penti .

Q1:Ki sa ki se minimòm konsepsyon metal la metal (MDMT) sètifikasyon pou A662 Klas C, ak ki jan li konpare ak klas A/B?

Limit sèvis sètifye:

Asme seksyon VIII div .1apwouve pou-120 degre(vs klas B a -101 degre)

Charpy V-Notch:Pi gran pase oswa egal a 34j nan-110 degre(baz metal) / pi gran pase oswa egal a 40J nan -90 degre (Weld)

ISO 21009-3Konfòmite pou sistèm LNG plen-kontwòl

Remak Espesyal:EgzijeFine pratik grenn(ASTM Non . 8 oswa sibtilite)

Q2:Ki sa ki ranje a kontni nikèl nan klas C, ak ki jan li afekte pèfòmans kriyojenik?

Chimi alyaj amelyore:

Nikèl:1.50-2.00% (vs 0.80-1.20% nan klas B)

Ultra-ba enpurte:P mwens pase oswa egal a 0.010%, s mwens pase oswa egal a 0.008%

Mikwo-alyaj:Ti (0.01-0.03%) + b (0.001-0.003%)

Avantaj métallurgique:

DBTT (Ductile-Brittle Tranzisyon Temp) <-150°C

Atravè-epesè Z-direksyon ψ pi gran pase oswa egal a 45%

Q3:Ki sa ki pwosedi yo soude obligatwa pou -196 degre sèvis nitwojèn likid?

Pwotokòl soude LH2/LN2:

Chofe:120-180 degre (thermocouple-kontwole)

Consommables:AWS A5.28 ER100S-NI3 (5.5%NI)

Kontwòl InterPass:Mwens pase oswa egal a 100 degre ki gen mwens pase oswa egal a 15kj/cm opinyon chalè

Tretman Post-Weld:

PWOPRIYE PWOGRAMANnan 600 ± 10 degre pou 2hrs +Simile tretman chalè pòs-soude (SPWHT)

Pwogresivman etalaj ut + tofd for thickness >30mm

Baj popilè: ASTM A662 Klas C pou plak veso presyon, Lachin ASTM A662 Klas C pou manifaktirè plak veso presyon, founisè, faktori