Project Description
Ⅰ. Overview of ASTM A516 Grade 70 Steel Plate:
ASTM A516 grade 70 Steel Plate is often used in the construction of welded pressure vessels where improved notch toughness is important. It’s the most widely used material grade than other grades such as the ASTM A516 grade 60 steel plate. A range of specially manufactured hydrogen induced crack resistant steel in ASTM A516 grade 70 HIC is also available.
Ⅱ. Maximum Thickness
|
Grade U.S.[SI]
|
Maximum Thickness, in.[mm]
|
|
55[380]
|
12[305]
|
|
60[415]
|
8[205]
|
|
65[450]
|
8[205]
|
|
70[485]
|
8[205]
|
Ⅲ. Chemical Requirements
| Elements |
Grade 55 (380)
|
Grade 60 (415)
|
Grade 65 (450)
|
Grade 70 (485)
|
| Carbon, max | ||||
| thk≤1/2in. (12.5mm) |
0.18
|
0.21
|
0.24
|
0.27
|
| thk>1/2in.~2in. (>12.5~50mm) |
0.20
|
0.23
|
0.26
|
0.28
|
| thk>2in.~4in.(50~100mm) |
0.22
|
0.25
|
0.28
|
0.30
|
| thk>4in.~8in.(100~200mm) |
0.24
|
0.27
|
0.29
|
0.31
|
| thk>8in.(200mm) |
0.26
|
0.27
|
0.29
|
0.31
|
| Manganese, max | ||||
| thk≤1/2in. (12.5mm) | ||||
| Heat Analysis |
0.60-0.90
|
0.60-0.90
|
0.85-1.20
|
0.85-1.20
|
| Product Analysis |
0.55-0.98
|
0.55-0.98
|
0.79-1.30
|
0.79-1.30
|
| thk>1/2in. (12.5mm) | ||||
| Heat Analysis |
0.60-1.20
|
0.85-1.20
|
0.85-1.20
|
0.85-1.20
|
| Product Analysis |
0.55-1.30
|
0.79-1.30
|
0.79-1.30
|
0.79-1.30
|
| Phosphorous, max |
0.025
|
0.025
|
0.025
|
0.025
|
| Sulfur, max |
0.025
|
0.025
|
0.025
|
0.025
|
| Silicon | ||||
| Heat Analysis |
0.15-0.40
|
0.15-0.40
|
0.15-0.40
|
0.15-0.40
|
| Product Analysis |
0.13-0.45
|
0.13-0.45
|
0.13-0.45
|
0.13-0.45
|
Ⅳ. Tensile Requirements
|
55[380]
|
60[415]
|
65[450]
|
70[485]
|
|
| Tensile Strength, ksi[Mpa] |
55-75[380-515]
|
60-80[415-550]
|
65-85[450-585]
|
70-90[485-620]
|
| Yield Strength, min, ksi[Mpa] |
30[205]
|
32[220]
|
35[240]
|
38[260]
|
| Elongation in 8 in.[200mm], min, % |
23
|
21
|
19
|
17
|
| Elongation in 2 in.[50mm], min, % |
27
|
25
|
23
|
21
|
Ⅴ. Heat Treatment
1. Plates 1.50 in. [40 mm] and under in thickness are normally supplied in the as-rolled condition. The plates may be ordered normalized or stress relieved, or both.
2. Plates over 1.50 in. [40 mm] in thickness shall be normalized.
3. When notch-toughness tests are required on plates 11⁄2in. [40 mm] and under in thickness, the plates shall be normalized unless otherwise specified by the purchaser
4. If approved by the purchaser, cooling rates faster than those obtained by cooling in air are permissible for improvement of the toughness, provided the plates are subsequently tempered in the temperature range 1100 to 1300°F [595 to 705°C].
