Application of Response Surface Methodology for Modeling of Postweld Heat Treatment Process in a Pressure Vessel Steel ASTM A516 Grade 70

Table 4

Matrix of PWTH parameters and response factor in tensile strength.

Std. order	Run order	PWHT time	PWHT temperature	Tensile strength (MPa)
1	9	10	520	531.10
2	12	10	520	532.80
3	20	10	520	527.20
4	1	20	520	528.00
5	5	20	520	533.30
6	18	20	520	527.00
7	10	10	620	547.30
8	25	10	620	542.00
9	2	10	620	549.70
10	29	20	620	515.20
11	19	20	620	513.30
12	32	20	620	519.20
13	36	15	570	530.25
14	11	15	570	534.44
15	4	15	570	538.60
16	27	15	570	539.10
17	7	15	570	536.80
18	15	15	570	541.00
19	17	5	570	545.88
20	22	5	570	548.71
21	35	5	570	543.13
22	26	25	570	529.00
23	14	25	570	517.50
24	31	25	570	526.00
25	3	15	470	520.00
26	28	15	470	516.00
27	23	15	470	523.90
28	8	15	670	511.32
29	30	15	670	519.48
30	13	15	670	512.50
31	33	15	570	538.25
32	6	15	570	528.62
33	34	15	570	537.44
34	21	15	570	534.10
35	24	15	570	531.00
36	16	15	570	536.40