Amalgated Metal Corp sdn.
bhd
Requirement of heat treatment for formed heads (UCS - 79 (ASME VIII-1)
(KEY IN VALUES FOR INDICATED PORTIONS ONLY)
APPLICABLE ONLY FOR CARBON AND ALLOY STEELS (Materials in Table UCS-23 (ASME VIII-1)
2:1 ELLIPTICAL HEAD AMC JOB NO C2186 Item No HEAD NUMBER
HEAD INSIDE DIAMETER(MM) - 'D' 1000 mm
CROWN RADIUS(MM) - 'R' 904.5 mm
KNUCKLE RADIUS(MM) - 'r' 172.70 mm
THICKNESS OF HEAD(NOMINAL - MM) - 't' 12.70 mm
MINIMUM ACTUAL THICKNESS -- 'tmin' 22.00 mm
FINAL CENTRELINE RADIUS(MM) - 'Rf' 179.05 mm
(KNUCKLE RADIUS + ONE HALF THICKNESS)
EXTREME FIBRE ELONGATION (%) 5.32 % STRESS RELIEF YES
Note 1
For P-No.1 Group Nos.1 and 2 materials
If fibre elongation is between 5 ~ 40% and comply to any one of clause in UCS 79*(Refer below table)it shall be stress relieved as per UCS 56
Note 2
Other than P-No.1 Group Nos.1 and 2 materials (<5% heat treatment not required. Refer Note 1,2 if the value exceeds 5%)
If fibre elongation is between 5% and comply to any one of clause in UCS 79*(Refer below table)it shall be stress relieved as per UCS 56
CONDITIONS YES NO
* a) The vessel will contain a lethal substance
b) The material requires impact tesing
c) The thickness of the part before forming exceeds 5/8" (16mm)
d)The reduction in thickness due to forming is more than 10% at any location where the fibre elongation exceeds 5%
Actual minimum thickness shall not be lower than 11.25mm
Percentage of reduction in thickness 8.00%
e) The temperature of the material during forming is between 250 F to 900 F (120 C to 480 C)
Based on the above Heat Treatment is Not required
Reference : ASME VIII-DIVISION I UCS-79 2004 Edition
EXTREME FIBER ELONGATION.123
Common used.
A. Carbon Steel
The following requirement shall apply to all and carbon manganese steels.
- Carbon content for carbon steel plate, pipe or forgings intended for welding shall not exceed 0.23%
- Carbon Equivalent shall satisfy the following requirement:
1. Ceq = C + Mn/6 < 0.42
(This formula may be used only if the material standard specifies C and Mn only)
2. Ceq = C + Mn/6 + (Cr + Mo + V)/5 + (Cu+Ni)/15 < 0.45
C Mn Cr Mo V Cu
Content
0.17 0.4 0.06 0.001 0.001 0.05
B. Duplex Stainless Steel
22Cr Duplex Stainless Steel (DSS) shall have minimum PRE of 34, where
- PRE(Pitting Resistance Equivalent) = %Cr + 3.3 x %Mo + 16 x %N
- ferrite content of each component is between 35% and 55% shall demonstrate, either by certification or by testing.
Content Cr Mo N PRE min 34
(%) 0.2 0.4 0.3 6.32
Accept YES
ot exceed 0.23% (ladle analysis)
Ni C < 0.42 C < 0.45
0.02 0.23666667 0.2537333
Accept YES YES
r by certification or by testing.
YES NOT
