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When it comes to high-performance steel plates for pressure vessels, ASTM A516 GR70 NACE HIC steel plate stands out as a top choice for industries requiring durability, corrosion resistance, and compliance with stringent standards. At Gangsteel, we specialize in exporting premium-quality A516 Gr70 plate designed to meet the demands of critical applications. This article explores the key features, benefits, and applications of this specialized steel plate.
The ASTM A516 GR70 specification is a standard for carbon steel plates used in pressure vessels for moderate and low-temperature services. When combined with NACE (National Association of Corrosion Engineers) and HIC (Hydrogen Induced Cracking) compliance, this boiler quality steel plate is engineered to perform in harsh environments where resistance to hydrogen-induced damage is critical. These plates are widely used in industries such as oil and gas, petrochemical, and power generation.
The chemical composition of ASTM A516 Grade 70 (HIC) steel plates is specified to ensure resistance to hydrogen-induced cracking (HIC) in sour service environments. The values below are maximum limits unless otherwise stated, as per ASTM A516/A516M and NACE TM0284 for HIC testing.
|
Element |
Composition (% by weight) |
Notes |
|---|---|---|
|
Carbon (C) |
0.27 - 0.31 |
Maximum, varies with plate thickness (≤0.27% for plates ≤12.5 mm). |
|
Manganese (Mn) |
0.79 - 1.30 |
For each 0.01% reduction in C below max, Mn may increase by 0.06% up to 1.50%. |
|
Phosphorus (P) |
0.025 |
Reduced for HIC resistance, stricter than standard A516 (0.035 max). |
|
Sulfur (S) |
0.025 |
Reduced for HIC resistance, stricter than standard A516 (0.035 max). |
|
Silicon (Si) |
0.15 - 0.40 |
Enhances oxidation and corrosion resistance. |
|
Aluminum (Al) |
0.02 (min) |
For deoxidation and fine grain structure (killed steel). |
|
Chromium (Cr) |
0.30 (max) |
Trace element, optional for enhanced corrosion resistance. |
|
Copper (Cu) |
0.30 (max) |
Trace element, optional for corrosion resistance. |
|
Nickel (Ni) |
0.30 (max) |
Trace element, optional for toughness. |
|
Molybdenum (Mo) |
0.08 (max) |
Trace element, optional for strength. |
|
Niobium (Nb) |
0.01 (max) |
Trace element for grain refinement. |
|
Titanium (Ti) |
0.03 (max) |
Trace element for grain refinement. |
|
Vanadium (V) |
0.02 (max) |
Trace element for strength. |
|
Carbon Equivalent (CEV) |
0.43 (max, ≤1.25" thick) |
CEV = C + Mn/6 + (Cr+Mo+V)/5 + (Ni+Cu)/15; stricter for HIC resistance. |
Notes:
The steel is fully killed and fine-grain treated to enhance HIC resistance.
HIC testing per NACE TM0284 ensures low sulfur and phosphorus content to minimize susceptibility to hydrogen-induced cracking in wet H2S environments.
Supplementary requirements (e.g., S1: Vacuum Treatment, S2: Product Analysis) may apply as per ASTM A20/A20M for enhanced quality control.
|
Property |
Value |
Notes |
|---|---|---|
|
Tensile Strength |
485 - 620 MPa (70,000 - 90,000 psi) |
Measured via tension test, ensuring high strength for pressure vessels. |
|
Yield Strength (min) |
260 MPa (38,000 psi) |
Minimum stress at which plastic deformation begins. |
|
Elongation (min, 200 mm gauge) |
17% |
Indicates ductility for 200 mm gauge length. |
|
Elongation (min, 50 mm gauge) |
21% |
Indicates ductility for 50 mm gauge length. |
|
Charpy V-Notch Impact Toughness |
Varies (typically 27 J at -46°C) |
Tested per ASTM A20 S5 for notch toughness in low-temperature service. |
|
Hardness (typical) |
200 HB (max) |
Approximate Brinell hardness for normalized plates. |
|
Property |
Value |
Notes |
|---|---|---|
|
Thermal Conductivity |
~52.0 W/m-K |
High thermal conductivity aids heat dissipation in boilers/pressure vessels. |
|
Density |
~7.85 g/cm³ |
Typical for carbon steel. |
|
Weldability |
Excellent |
Low carbon and controlled alloying ensure good weldability. |
|
HIC Resistance |
NACE TM0284 compliant |
Tested for resistance to hydrogen-induced cracking in wet H2S environments. |
These properties make the boiler quality steel plate suitable for demanding applications where strength and durability are paramount.
The A516 Gr70 plate is widely used in industries requiring robust materials for extreme conditions:
At Gangsteel, we pride ourselves on delivering high-quality ASTM A516 pressure vessel steel tailored to your needs. Our advantages include:
The ASTM A516 GR70 NACE HIC steel plate is a reliable and versatile solution for industries requiring robust materials for pressure vessels and corrosive environments. With its excellent mechanical properties, HIC resistance, and NACE compliance, this boiler quality steel plate ensures safety and longevity in critical applications. Contact Gangsteel today to learn more about our high-quality A516 Gr70 plate and how we can meet your project needs.
For more details, explore our product page or reach out to our team for personalized assistance.
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