What is Q345NS Sulfuric Acid Corrosion Resistance Steel Plate?
Q345NS is a high-strength low-alloy steel specifically designed for resistance to sulfuric acid dew point corrosion. With a minimum yield strength of 345 MPa, it offers a strong combination of mechanical performance and excellent acid corrosion resistance in low-temperature flue gas environments.
Compared with ordinary carbon steel, Q345NS can reduce the sulfuric acid dew point corrosion rate by approximately 50%–70% in boilers, economizers, and flue gas systems, and extend service life by about 2–3 times, especially in environments where acidic condensation frequently occurs.
We are a leading supplier of Q345NS sulfuric acid dew point corrosion-resistant steel plates in China, specializing in solving corrosion failure issues caused by low-temperature acidic condensation in boilers, flue gas ducts, and economizer systems.
During the melting and rolling process, Q345NS steel plates are produced under strict control of inclusion content, and online inspection is applied to ensure uniform microstructure and consistent mechanical properties.
In environments containing SO₂ and moisture, where acidic condensation occurs, Q345NS maintains stable corrosion resistance. Compared with ordinary carbon steel, it can reduce the sulfuric acid dew point corrosion rate by approximately 50%–70%, significantly slowing down corrosion failure.
We supply Q345NS steel plates in a wide range of specifications, with thickness typically covering 6 mm – 120 mm to meet common engineering requirements. Customized services such as cutting-to-size, edge preparation, and surface treatment are also available according to project needs.
The product is widely used in boiler heating surfaces, air preheaters, economizers, flue gas systems, and other applications prone to sulfuric acid dew point corrosion, effectively reducing overall maintenance costs by approximately 30%–50%.
If you have any questions or would like to learn more about our products, especially Q345NS sulfuric acid dew point corrosion-resistant steel plates, please feel free to contact us.
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Q345NS Steel Plate Specification
| Item | Specification |
|---|---|
| Product Name | Q345NS Sulfuric Acid Dew Point Corrosion-Resistant Steel Plate |
| Material Grade | Q345NS / Low-Alloy High-Strength Steel |
| Standard | GB/T 713 / GB/T 1591 (for reference application standards depending on use) |
| Product Form | Hot Rolled Steel Plate / Structural Steel Plate |
| Thickness Range | 6 mm – 120 mm |
| Width Range | 1000 mm – 2500 mm |
| Length Range | 2000 mm – 12000 mm (or customized cutting) |
| Surface Condition | Hot rolled / Shot blasted / Pickled (optional) |
| Manufacturing Process | Melting → Continuous Casting → Controlled Rolling (TMCP) → Controlled Cooling → Straightening |
| Delivery Condition | As rolled / Normalized / Controlled rolled condition |
| Yield Strength | ≥ 345 MPa |
| Tensile Strength | 470 – 630 MPa |
| Elongation | ≥ 21% |
| Corrosion Performance | Excellent resistance to sulfuric acid dew point corrosion |
| Certification | ISO 9001 / SGS / BV / EN 10204 3.1 or 3.2 |
| Inspection | Chemical composition analysis, tensile test, impact test, UT testing, dimensional inspection |
| Packaging | Waterproof paper, plastic film, steel straps, wooden pallets, seaworthy export packing |
Q345NS Steel Plate Chemical Composition
| Element | Content (%) |
|---|---|
| Carbon (C) | ≤ 0.12 |
| Silicon (Si) | 0.20 – 0.50 |
| Manganese (Mn) | 0.80 – 1.50 |
| Phosphorus (P) | ≤ 0.025 |
| Sulfur (S) | ≤ 0.015 |
| Chromium (Cr) | 0.30 – 0.80 |
| Nickel (Ni) | ≤ 0.30 |
| Copper (Cu) | 0.20 – 0.50 |
| Iron (Fe) | Balance (Remaining) |
Q345NS Steel Plate Physical Properties
| Property | Value |
|---|---|
| Density | ~7.85 g/cm³ |
| Yield Strength | ≥ 345 MPa |
| Tensile Strength | 470 – 630 MPa |
| Elongation | ≥ 21% |
| Elastic Modulus | ~200 GPa |
| Poisson's Ratio | ~0.30 |
| Impact Toughness | ≥ 34 J (at room temperature, typical requirement depending on standard) |
| Hardness | ~140 – 180 HB (typical range) |
| Thermal Conductivity | ~45 – 55 W/m·K |
| Thermal Expansion Coefficient | ~11 – 13 ×10⁻⁶ /K |
| Service Temperature | Suitable for low to medium temperature flue gas environments |
| Corrosion Performance | Excellent resistance to sulfuric acid dew point corrosion |
Q345NS Steel Plate Tolerance
| Item | Tolerance |
|---|---|
| Thickness Tolerance | ±0.3 mm (≤10 mm) / ±0.5 mm (10–50 mm) / ±1.0 mm (50–120 mm) |
| Width Tolerance | 0 / +10 mm |
| Length Tolerance | 0 / +15 mm (cut-to-length condition) |
| Flatness Tolerance | ≤ 5 mm/m (depends on thickness and rolling condition) |
| Diagonal Tolerance | ≤ 10 mm (standard plates) |
| Edge Deviation | Slight irregularity allowed for flame-cut or sheared edges |
| Surface Quality | No cracks, no delamination, minor rolling marks acceptable |
| Weight Tolerance | ±5% (theoretical weight basis) |
Q345NS Steel Plate Inventory List
| Thickness (mm) | Standard Width (mm) | Standard Length (mm) | Stock Status | Weight Range (per sheet) |
|---|---|---|---|---|
| 6 mm | 1500 / 1800 / 2000 | 6000 / 12000 | In Stock | ~280 – 560 kg |
| 8 mm | 1500 / 1800 / 2000 | 6000 / 12000 | In Stock | ~370 – 740 kg |
| 10 mm | 1500 / 1800 / 2000 | 6000 / 12000 | In Stock | ~460 – 920 kg |
| 12 mm | 1500 / 1800 / 2000 | 6000 / 12000 | In Stock | ~560 – 1120 kg |
| 14 mm | 1500 / 1800 / 2000 | 6000 / 12000 | In Stock | ~650 – 1300 kg |
| 16 mm | 1500 / 1800 / 2000 | 6000 / 12000 | In Stock | ~740 – 1480 kg |
| 20 mm | 1500 / 1800 / 2000 | 6000 / 12000 | In Stock | ~930 – 1860 kg |
| 25 mm | 1500 / 1800 / 2000 | 6000 / 12000 | Limited Stock | ~1160 – 2320 kg |
| 30 mm | 1500 / 1800 / 2000 | 6000 / 12000 | Limited Stock | ~1390 – 2780 kg |
| 40 mm | 1500 / 1800 / 2000 | 6000 / 12000 | Made to Order | ~1850 – 3700 kg |
| 50 mm | 1500 / 1800 / 2000 | 6000 / 12000 | Made to Order | ~2320 – 4640 kg |
| 60 mm – 120 mm | Customized | Customized | Made to Order | Depends on specification |
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What is difference between the Q345B and Q345NS Steel Plate
Q345B is a general structural steel with no special corrosion resistance, while Q345NS is designed for sulfuric acid dew point corrosion environments.
Compared with Q345B, Q345NS can reduce corrosion rate by about 50%–70% in flue gas systems and extend service life by approximately 2–3 times, especially in boilers, economizers, and acidic condensation conditions.
What is difference between the Q245R and Q345NS Steel Plate
Q245R is a boiler and pressure vessel steel mainly designed for strength and pressure-bearing performance, while Q345NS is a low-alloy steel designed for sulfuric acid dew point corrosion resistance in flue gas systems.
ompared with Q245R, Q345NS provides better anti-corrosion performance in acidic condensation environments, reducing corrosion rate by about 50%–70% and extending service life by approximately 2–3 times, especially in boilers, economizers, and flue gas ducts.
We provide Mill Test Certificates (MTC), raw material certificates, high-temperature performance reports, non-destructive testing (NDT) reports, and third-party inspection reports in accordance with EN 10204 3.1 for Q345NS steel plates.
Quality Inspection of Q345NS Steel Plate
We ensure that all Q345NS steel plates undergo strict quality control and testing before shipment to guarantee stable performance in sulfuric acid dew point corrosion environments.
• Mechanical property testing (tensile strength, yield strength, elongation)
• Hardness testing
• Chemical composition analysis – spectral analysis
• Material identification – PMI testing
• Ultrasonic testing (UT) for internal defects
• Dimensional inspection (thickness, width, length)
• Surface quality inspection (cracks, laminations, defects)
Our Q345NS steel plates are specially packaged to ensure no damage occurs during transportation. Export products are packed in standard seaworthy packaging, using wooden pallets or wooden crates.
All Q345NS steel plates are clearly marked with our company logo, steel grade, dimensions, and heat number. Customized marking services are also available upon request.
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