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The challenge in making a material choice is actually verifying that the chosen material best fits the application. This involves taking into account working conditions and flow media properties. 
Most important concerning the working conditions is to know the pressure and temperature ratings and for working media is to take in consideration corrosive and erosive properties. Additionally, it might be needed to consider thermal and physical shock, line stress and fire hazards. 
Generally speaking when considering temperature limitations of different groups of materials Table 1. should be used as general reference for material selection.



Material Name

 

Applicable conditions

ANSI/ASTM

GB

Casting

Forged

Casting

Forged

Use Tem.

Main medium

Carbon Steel

WCB

A105

ZG2511

25/20Mh

-29—427

WaterGasAirOil etc.,

Alloy Steel

WC1

F1

/

/

-29—454

GasOil product
(Mainly used in high temperature & High Pressure) 

C5

F5

ZGCr5Mo

2Cr5Mo

-29—650

WC6

F11

ZG20CrMoV

15CrMo
12CrMoV

-29—552

WC9

F22

ZG15Cr1Mo1V

12Cr1MoV
25Cr2MoV
20Cr1Mo1VA

-29—595

Stainless steel

CF8

304

ZG0Cr18Ni9Ti
ZG0Cr18Ni12Mo2Ti

0Cr19Ni9
0Cr18Ni12Mo2Ti

-196—800

Corrosive medium

Such as Nitric acid

Stainless steel

CF8M

316

-196—800

Corrosive media such as acetic acid and urea

Chrome nickel molybdenum stainless steel

CF3

304L

00Cr19Ni11

-196—425

Corrosive medium

Such as Nitric acid

Chrome nickel molybdenum ultra low carbon stainless steel

CF3M

316L

00Cr17Ni14Mo2

-196—455

Corrosive media such as acetic acid and urea

Alloy 20

CN7M

B462

ZG0Cr20Ni29Cu4Mo2

0Cr20Ni35Mo3Cu4Nb

-196—450

H2SO4H3PO4HFHCL(Mainly used in H2SO4)

N08020

Alloy 40

CD-4MCu

S32550

ZG0Cr25Ni5Mo2Cu3

0Cr25Ni5Mo2Cu3

-196—450

H3PO4H2SO4H2PO4(Mainly used in H3PO4)

Fnalium255

Monel

M35-1 M-30C

No4400

 

NiCu28-2.5-1.5

-196—580

HFHCLH2SO4
PFCNaOH
(Mainly used in HF)

No4405

k400

k500