Contact Platform Support
Help Center09crcusb Low - Alloy Round Steel Resistant to Sulfuric Acid Dew Point, Low - Temperature nd Steel Rod for Power Plant Boilers, Large - Sized Reformed Small Rounds
Related Products
-
High-strength Medium-carbon Alloy Structural Round Steel of 40crmnmoa, Alloy Round Bar for Heavy-duty Gear Shafts of 20crmnmoaUS$ 1.46 - 1.77MOQ: 10 Kilograms -
Valve Forging A350 Lf2/lf3/lf5/lf6 Low Alloy Round Steel, Low Temperature Alloy Round Bar, Quality Assurance With GoodsUS$ 1.46 - 1.62MOQ: 10 Kilograms
-
Low-alloy High-strength 39nicrmo3 Chromium-nickel-molybdenum Alloy Steel, German Standard 1.6510 Steel for Aerospace Engine ShaftsUS$ 1.46 - 1.62MOQ: 10 Kilograms
-
High-hardness Roll Steel 85cr3mo Round Steel, High-wear-resistant 85cr5mo Alloy Steel Bar, Non-standard Customization, Fast DeliveryUS$ 1.46 - 1.62MOQ: 10 Kilograms
-
European Standard High-strength 36nicrmo16 Alloy Round Steel, 36crnimo4 Alloy Round Bar With Low-temperature Impact Resistance, CuttingUS$ 1.46 - 1.62MOQ: 10 Kilograms
Industry Pain Points and Solutions
In the operation of power plant boilers, low-temperature parts (such as air preheaters, economizers, flue ducts, etc.) have long been suffering from sulfuric acid dew point corrosion caused by the condensation of sulfur-containing flue gas. The temperature of this corrosive environment is usually between 100 and 160℃, and the concentration of sulfuric acid droplets is as high as 50% - 80%, which causes rapid and serious local perforation and thinning of ordinary carbon steel and conventional low-alloy steel, resulting in frequent equipment leakage, high costs for furnace shutdown and maintenance, and even safety accidents. According to statistics, boiler unplanned shutdowns caused by flue gas dew point corrosion account for more than 30% of the total boiler failures.
Liaocheng Jincheng Yangming Special Steel Co., Ltd., as a professional enterprise deeply involved in the special steel field, relying on years of R & D experience in corrosion-resistant materials, has launched sulfuric acid dew point corrosion-resistant low-alloy 09CrCuSb round steel (ND steel). By precisely controlling the ratio of alloying elements such as chromium, copper, and antimony, this material forms a dense and self-repairing passivation film on the steel surface, effectively inhibiting the penetration of sulfate ions into the matrix and reducing the corrosion rate to 1/5 - 1/10 of that of ordinary carbon steel. At the same time, we provide the service of reprocessing large-diameter round steel into small-diameter ones (for example, rolling Φ300mm into any specification between Φ50 and 200mm), meeting the convenient procurement needs of power plant customers for special-shaped sizes and short materials, and avoiding the waste of secondary processing caused by size mismatch in traditional procurement. We truly solve the pain point of low-temperature corrosion at the source, helping power plants reduce operation and maintenance costs and extend the service life of equipment.
Working Mechanism and Product Characteristics
09CrCuSb belongs to the low-alloy steel resistant to sulfuric acid dew point corrosion (ND steel), and its core working mechanism is based on the following three points:
- Alloy Layer Protection Mechanism: The Cr (0.5 - 1.2%), Cu (0.3 - 0.6%), and Sb (0.04 - 0.10%) added to the steel preferentially form a dense composite oxide film of γ-Fe₂O₃ and Cu₂O in a sulfuric acid environment, hindering the diffusion of H⁺ and SO₄²⁻. The Sb element can refine the grains and improve the stability and peeling resistance of the protective film.
- Self-Repair of the Passivation Film: When the film layer is locally damaged, Cu and Sb in the matrix quickly migrate to the damaged area to rebuild the passivation layer, achieving dynamic protection.
- Low-Temperature Toughness Guarantee: By strictly controlling the P and S contents (P ≤ 0.030%, S ≤ 0.015%) and cooperating with micro-alloying treatment, the material still has good impact toughness at -20℃, adapting to the low-temperature environment in northern winters.
Technical Specifications and Parameters (Reference Values)
| Project | Parameter |
| Grade | 09CrCuSb (ND Steel) |
| Implementation Standard | Refer to GB/T 1501, GB/T 702 (Round Steel) |
| Round Steel Diameter Range | Φ20mm - Φ300mm (Can be Remanufactured into Smaller Diameters) |
| Chemical Composition (wt%) | C ≤0.12, Si 0.20 - 0.50, Mn 0.35 - 0.65, Cr 0.50 - 1.20, Cu 0.30 - 0.60, Sb 0.04 - 0.10, P≤0.030, S≤0.015 |
| Mechanical Properties (Typical Values) | Tensile Strength ≥345MPa, Yield Strength ≥235MPa, Elongation ≥22%, Impact Energy (-20℃) ≥27J |
| Sulfuric Acid Corrosion Resistance Rate | ≤0.5mm/year (Tested under the Conditions of 30% H₂SO₄ at 60℃) |
| Surface Condition | Black Skin / Turned (Negotiable) |
Core Advantages of the Product
- Precise Resistance to Sulfuric Acid Dew Point Corrosion: Laboratory data and on - site coupon tests show that in the flue gas dew point temperature range of power plants (100 - 160℃), its corrosion - resistant life is 4 - 6 times that of 20G steel and 1.5 times that of 304 stainless steel (304 is prone to intergranular corrosion in sulfuric acid).
- Remanufacturing Service for Large - Sized Round Steel: Support the remanufacturing of large - diameter round steel such as Φ250mm, Φ280mm, Φ300mm into commonly used small - diameter round steel such as Φ60mm, Φ80mm through precision sawing + forging/rolling, and ensure uniform internal structure, no segregation, and meet the requirements of non - destructive testing.
- Stable Alloy Ratio and Quality Consistency:Using the electric arc furnace + LF furnace + VD vacuum degassing refining process, the chemical composition is uniform, and the performance fluctuation between batches is ≤5%.
- Good processing performance: It can undergo conventional machining operations such as turning, milling, planing, drilling, and welding. There is no need for preheating before welding and no heat treatment after welding (it is recommended to use austenitic stainless steel electrodes such as E309Mo), which simplifies the on - site construction process.
- Excellent economy: Compared with stainless steel (316L, 904L), the comprehensive cost is reduced by 40% - 60%, and the maintenance cycle is extended to once every 2 - 3 years. The cost - performance ratio over the entire life cycle is outstanding.
Examples of application scenarios
- Boilers in coal - fired power plants/biomass power plants: Heat exchange tubes in the low - temperature section of air preheaters, flue support beams, baffles, and tube bundles in the slag discharge system.
- Chemical industry: Coolers, pickling tanks, and internal components of tail gas treatment towers in sulfuric acid production plants.
- Iron and steel metallurgy: Flue gas desulfurization equipment for sintering machines and pelletizing rotary kilns.
- Waste incineration power generation: Low - temperature heat exchange areas of waste heat boilers and flue gas purification systems.
Trust endorsement and company advantages
Since its establishment, Liaocheng Jincheng Yangming Special Steel Co., Ltd. has always adhered to the business philosophy of "seeking truth from facts and honesty as the foundation" and has accumulated rich technical experience in the field of corrosion - resistant special steel. The company is equipped with a full set of testing equipment such as direct - reading spectrometers, universal testing machines, impact testing machines, and metallographic microscopes to ensure that the chemical composition and mechanical properties of the round steel leaving the factory meet the standards 100%. We have provided 09CrCuSb round steel and fabricated parts for the boiler overhaul projects of many large domestic power groups (such as Huaneng, Datang, Guodian, etc.), with a cumulative supply of more than 8000 tons. Customer feedback shows that the service life of the equipment has been extended by more than 2 years, and no serious leakage accidents caused by corrosion have occurred. At the same time, our company maintains technical exchanges with multiple provincial special equipment inspection institutes, and the products can be used in conjunction with third - party non - destructive testing and coupon corrosion tests.
For customers with special specification requirements, we can provide customized size fabrication: Whether you need Φ40mm, Φ65mm, or Φ150mm, just provide the drawings or clarify the length requirements, and we can complete the material preparation and fabrication within 5 - 7 working days. We are well aware of the strict requirements for timeliness of boiler spare parts, so we always keep stocks of large - size round billets of Φ200mm, Φ250mm, and Φ300mm, and have a 24 - hour emergency response hotline.
Consultation advice
Choosing the right material resistant to sulfuric acid dew point corrosion not only concerns the service life of the equipment but also directly affects the annual power generation efficiency and safe operation of the power plant. If you are facing the problem of low - temperature corrosion in the boiler or planning to upgrade the air preheater and flue, it is recommended that you provide basic parameters such as the on - site flue gas composition, dew point temperature, and the current status of the equipment material. We will assist you in evaluating the corrosion rate and recommend the most economical material specifications (including the round steel diameter and fabrication plan). We sincerely welcome you to call or consult through the platform. The professional technical team of Liaocheng Jincheng Yangming Special Steel Co., Ltd. looks forward to discussing the optimal solution with you.
FAQ (Frequently Asked Questions for Buyers)
-
Q1: How big is the difference in sulfuric acid corrosion resistance between 09CrCuSb round steel and ordinary Q345B round steel?
A1: In a simulated power plant flue gas dew point environment (30% H₂SO₄, 80℃), the corrosion rate of 09CrCuSb is about 0.3mm/year, while that of Q345B reaches over 2.5mm/year. The durability of the former is improved by over 8 times, and no local pitting occurs. -
Q2: Will the mechanical properties of the material decline after a large-diameter round steel is reformed into a small-diameter one?
A2: No. We use the forging heating + controlled cooling process. After the reforming, the grain structure is more refined, and the strength and toughness indicators are better than those of the original large-diameter round steel, which can meet the requirements of ASTM A615 standard. 100% of the reformed parts are subjected to ultrasonic flaw detection to ensure no internal defects. -
Q3: Can 09CrCuSb round steel be hot-bent or hot-formed?
A3: Yes. The recommended heating temperature is 850 - 950℃, and the holding time is calculated as 30 minutes of holding for every 25mm of section thickness. Air cooling after hot bending is sufficient, and no subsequent heat treatment is required. However, it is necessary to prevent overburning, and it is recommended to form quickly after heating. -
Q4: How is the welding performance of this material? Are special welding materials and post-weld heat treatment required?
A4: The weldability is good. The recommended electrode is E309Mo - 16 (austenitic type), and the welding wire is ER309LSi. The welding line energy is controlled at 15 - 25kJ/cm, and the inter-pass temperature is ≤150℃. Generally, no post-weld heat treatment is required. However, for complex structures or thick-plate welding, a hydrogen elimination treatment at 250℃ for 2 hours can be carried out. -
Q5: How does your company ensure the dimensional tolerance and surface quality of the round steel?
A5: We use high-precision rolling mills or cold drawing processes. The diameter tolerance can be controlled within ±0.5mm (black skin) or ±0.2mm (turned smooth). The surface has no defects such as cracks, folds, and scabs, and the original material quality certificate is provided. For the reformed small-diameter round steel, a sawing service with an end face perpendicularity ≤1° is provided. -
Q6: Does your factory provide small-batch trial orders? What is the minimum order quantity?
A6: Small-batch trial orders are supported. The regular minimum order quantity is 1 ton (mixed specifications are acceptable). For special reformed sizes, the minimum order quantity can be reduced to 500kg. We understand the caution during the trial stage of new materials and are willing to share the pre-verification costs with customers. -
Q7: Will 09CrCuSb round steel experience brittle fracture when used in cold northern regions (such as -30℃)?
A7: This material has good low-temperature impact toughness by optimizing the carbon-manganese ratio and adding trace elements. The typical impact energy of the V-notch can still remain ≥24J at -40°C, meeting the requirements of Grade E steel in GB/T 1591. There have been no cases of brittle fracture during long-term use in a -30°C environment. -
Q8: Is the ND steel round bar suitable for a flue gas environment with a high chloride ion content?
A8: 09CrCuSb has low sensitivity to pitting corrosion caused by chloride ions. However, under high-chlorine (Cl⁻ > 500ppm) and high-humidity conditions, it is recommended to use a coating (such as enamel or PTFE) in combination. Liaocheng Jincheng Yangming Special Steel Co., Ltd. can provide a bimetallic composite round bar solution to further improve the resistance to chlorine corrosion.
Send Inquiry to This Supplier
You May Also Like
-
Free-cutting Alloy 16mncrs5 Carburized Round Steel, German Standard 1.7139 Steel Bar, the Main Steel for Manufacturing Gear PartsUS$ 1.46 - 1.62MOQ: 10 Kilograms
-
Hot-rolled Round Steel Scm445 for Japanese Standard Oil Drill Pipes and Drill Collars. Hardenability Scm445h Structural Steel Bars. CuttingUS$ 1.46 - 1.62MOQ: 10 Kilograms
-
European Standard High Hardenability 20mncrs5 Alloy Structural Round Steel, Steel for High-precision Gears in Mechanical Manufacturing (1.7149)US$ 1.46 - 1.62MOQ: 10 Kilograms
-
in Stock, 42crmo4 Round Steel Cut to Order, 42crmo4v Alloy Steel Forging Round Bars, qt Quenched and Tempered, Polished, Guaranteed Material QualityUS$ 1.46 - 1.62MOQ: 10 Kilograms
-
German Standard Low-alloy Chromium-molybdenum 50crmo4 Quenched and Tempered Round Steel, American Standard Sae 4150 Steel Bar, Customizable From 16 to 600, Cutting AvailableUS$ 1.46 - 1.62MOQ: 10 Kilograms
-
35crni3wa Alloy Round Steel for Mine Drilling Equipment, Highly Wear-resistant 35crni3mov Round Bar, Sufficient Steel IngotsUS$ 1.46 - 1.62MOQ: 10 Kilograms
-
Jingcheng Yangming American Standard A182f5 Round Steel, Martensitic Heat-resistant f5 Alloy Steel Bar, Forgings, Non-standard Customization, 80 CuttingUS$ 1.46 - 1.62MOQ: 10 Kilograms
-
Boiler Steel A182 F92 Round Steel, A182 F91 Alloy Steel Bars for Boiler Hangers and Valves, Cut, High - Quality From Large ManufacturersUS$ 1.46 - 1.62MOQ: 10 Kilograms
-
Xianggang 30crmoa Alloy Steel, High Hardenability 30crmoa Round Steel, Cut to Length From 16 to 300, Packed, Guaranteed Material QualityUS$ 1.46 - 1.62MOQ: 10 Kilograms
-
Yangming 20crmo Round Steel Bar Material, 20crmoa Alloy Steel Bar With Custom Cutting and Retail Sales, Complete Range of Round Bar SpecificationsUS$ 1.46 - 1.62MOQ: 10 Kilograms
