MPC YS For carbon steel <40 ksi yield From API-579
 7.32895590E-02 
 1.17762521E-03 


2.38047105E-06 

C 
 3.41856446E-09 
 2.30957367E-12 


 6.50662295E-16 
σysrt  35 ksi
 300 
 350 


 400 
 450 
 500 


 550 
 600 


 650 
 700 
T   750 


 800 
 850 
 900 


 950 
 1000 


 1112 
 1200 
 1300 


 1400 
degF
n  0  18
C0 C1 Tn C2  Tn 2C3  Tn 3 C4  Tn 4C5  Tn 5
σys  σysrt  e
n
0
σys 
0
0
30.399
0
300
1
29.748
1
350
2
29.141
2
400
3
28.558
3
450
4
27.984
4
500
5
27.409
5
550
6
26.825
6
600
7
26.229
7
650
8
25.619
8
700
9
24.993
9
750
10
24.35
10
800
11
23.689
11
850
12
23.01
12
900
13
22.309
13
950
14
21.581
14
1·103
15
19.829
15
1.112·103
16
18.286
16
1.2·103
17
16.292
17
1.3·103
18
13.988
18
1.4·103
T
 ksi
API 530 data for medium carbon steel From API-579
 1.6434698E+00 
 3.5201715E-03 


5.8080277E-06 

A 
 4.2398160E-09 
 8.7536764E-13 


 0.0000000E+00 
σy  σytm A  A  T  A  T
1 n
2 n
 0
n
σytm  30.5 ksi
at 300F
   A3 Tn  A4 Tn  A5 Tn 
2
3
4
5
0
0
σy 
0
30.584
1
29.105
2
27.93
3
26.994
4
26.234
5
25.59
6
25.007
7
24.435
8
23.827
9
23.139
10
22.333
11
21.374
12
20.231
13
18.877
14
17.29
15
12.794
16
8.283
17
2.076
18
-5.255
 ksi
T
0
300
1
350
2
400
3
450
4
500
5
550
6
600
7
650
8
700
9
750
10
800
11
850
12
900
13
950
14
1·103
15
1.112·103
16
1.2·103
17
1.3·103
18
1.4·103
Data from WRC 541 for medium carbon steel From API-579
σrt  35 ksi
 1.4088389E-02 
 1.9932341E-04 


2.0694516E-08 

C2 
 1.0013720E-10 
 0.0000000E+00 


 0.0000000E+00 
 C20C21 TnC22  Tn 2C23  Tn 3C24  Tn 4C25  Tn 5
σy2  σrt 10

n
0
σy2 
0
0
31.174
0
300
1
30.309
1
350
2
29.424
2
400
3
28.52
3
450
4
27.593
4
500
5
26.645
5
550
6
25.673
6
600
7
24.68
7
650
8
23.667
8
700
9
22.635
9
750
10
21.587
10
800
11
20.525
11
850
12
19.454
12
900
13
18.377
13
950
14
17.298
14
1·103
15
14.901
15
1.112·103
16
13.066
16
1.2·103
17
11.068
17
1.3·103
18
9.2
18
1.4·103
 ksi
T