One of the most often used steel grades is ASME SA516 HIC Resistant Plates grade 70. It's intended use is mostly in welded pressure vessels where notch toughness is crucial. The adaptability of these grades, which range in tensile strengths from 55 to 90 MPa, contributes significantly to the standards' widespread use. Carbon steel pressure vessel plates for moderate and low temperatures that meet ASTM A 516/A 516M standards For plates that are thinner than 40 mm, supplies are usually rolled. Plates that are thicker than 40 mm are normalized. The ASME standard composition for SA516 Grade 70, one of the most widely used steels, is as follows (grade dependent)
Boiler manufacturers and fabricators utilize HIC Resistant Steel Plate when Hydrogen Induced Cracking poses a significant risk.According to ASME/ASTM standards, the most popular grade of HIC resistant steel plate is A516. A single plate can satisfy the requirements for any of the three grades A516 60/65/70 + HIC because it will typically be certified to grades 60, 65, and 70. After the A516 plate is manufactured, a sample is tested using one of two test solutions to determine whether it complies with the requirements of TM0284, the NACE standard for the evaluation of pipeline and pressure vessel steels for resistance to hydrogen-induced cracking. These are, to put it simply, acidic liquids that replicate the corrosive effects of the circumstances that cause HIC Crackingstays in the
After a few days in the solution, the steel is removed and studied under a microscope to identify any cracks that have formed.
The market for P355 plates with HIC resistance is minimal, even if it is possible to obtain HIC plates to other standards. About 90% of all HIC plates made by Mills to customer specifications are to A516. As a result, all of our standards for poor service are in compliance with ASTM.
Extra low sulfur, phosphorus, and other residual elements are the only elements allowed in this substance. In accordance with NACE Standard TM0284, HIC tests are conducted for each heat and thickness. Excellent outcomes are obtained in maintaining the CLR (Crack Length Ratio), CTR (Crack Thickness Ratio), and CSR (Crack Sensitivity Ratio).
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Specification:
| Property | Specification |
| Material Type | Carbon Steel |
| Grade | SA516 Grade 70 |
| Thickness Range | 6mm - 150mm |
| Width Range | 1500mm - 3200mm |
| Length Range | 3000mm - 12000mm |
| Tensile Strength | 70,000 psi (485 MPa) min. |
| Yield Strength | 38,000 psi (260 MPa) min. |
| Elongation | 21% min. in 2" (50mm), 25% min. in 8" (200mm) |
| Charpy V-Notch Impact Test | -50°F (-46°C) minimum average energy absorption, 20 ft-lbs (27 J) minimum |
| Hydrogen Induced Cracking (HIC) Resistance | Tested to NACE TM0284 (Solution A) |
| Sulfide Stress Corrosion Cracking (SSC) Resistance | Tested to NACE MR0175 |
| Heat Treatment | Normalized |
| Certification | EN 10204 3.1 or 3.2 |
Chemical composition of ASME SA516 GRADE 70 HIC RESISTANT STEEL PLATES
| Element | Composition Range (%) |
| Carbon (C) | 0.27 - 0.31 |
| Manganese (Mn) | 0.85 - 1.20 |
| Phosphorus (P) | 0.025 |
| Sulfur (S) | 0.025 |
| Silicon (Si) | 0.15 - 0.40 |
| Silicon (Si) | 0.15 - 0.40 |
| Nickel (Ni) | 0.40 - 0.70 |
| Chromium (Cr) | 0.30 - 0.70 |
| Molybdenum (Mo) | 0.12 - 0.25 |
| Copper (Cu) | 0.30 (max) |
Mechanical Properties of ASME SA516 GRADE 70 HIC RESISTANT STEEL PLATES
| Property | Value |
| Tensile Strength | 70,000 psi (485 MPa) min. |
| Yield Strength | 38,000 psi (260 MPa) min. |
| Elongation | 21% min. in 2" (50mm) |
| 25% min. in 8" (200mm) | null |
| Charpy V-Notch Impact Test | -50°F (-46°C) minimum average energy absorption, 20 ft-lbs (27 J) minimum |
Advantages of ASME SA516 GRADE 70 HIC RESISTANT STEEL PLATES
- Good general corrosion resistance and high strength
- Good sulfide stress corrosion resistance
- Resistance to chloride pitting and crevice corrosion
- Higher resistance to chloride stress corrosion cracking
- Easy to weld and conform
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Applications Industry
| Pharmaceutical Equipment | Chemical Equipment |
| Sea Water Equipment | Heat Exchangers |
| Heat Exchangers | Gas Processing |
| Condensers | Specialty Chemicals |
| Pulp and Paper Industry | Pharmaceuticals |
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