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Help CenterSteel Sheet & Plate & Boiler Steel Plate，Q245R、Q345R、Q370R、Q420R、Q460R、15CrMoR、14Cr1MoR、12Cr1MoVR
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1. Product Overview
Boiler Steel Plate refers to special pressure-bearing medium & heavy steel plates for boilers, complying with national standard GB/T 713-2023. It is specially applied for high temperature & high pressure pressure components of power station boilers, industrial boilers, waste heat boilers, including steam drums, water walls, headers, heat exchangers and pressure-bearing furnace shells.
Manufactured via LF+VD vacuum refined killed steel smelting, it strictly controls harmful impurities such as sulfur, phosphorus, hydrogen and oxygen. It features stable high-temperature stress rupture strength, creep resistance, excellent hot & cold forming performance, low-temperature impact toughness and superior weldability. It can continuously bear high-temperature steam, alternating pressure and flue gas corrosion, acting as core safety pressure-bearing raw material for thermal power, chemical industry and biomass energy boilers. It is strictly regulated by special equipment codes, with complete special equipment inspection certificates supplied together with delivery.
High Temperature Pressure Bearing Service Principle
The inner side of boiler plates bears high-temperature water vapor, while the outer side is exposed to high-temperature flue gas, enduring long-term cyclic thermal alternating loads. Precise alloy ratio and heat treatment refine grains to form stable metallographic structure within 450℃ for carbon grades and 580℃ for Cr-Mo alloy grades, restraining high-temperature creep deformation. Ultra-low impurity content greatly reduces risks of welding hydrogen-induced cracks and lamellar tearing, avoiding bulging, leakage and cylinder burst during long-term operation to ensure safe and stable boiler operation.
2. Main Steel Grades, Delivery Status & Applicable Working Conditions
2.1 Carbon Boiler Plate (Medium-Low Temperature & Medium-Low Pressure General Boiler)
Q245RMinimum yield strength ≥245MPa, service temperature ≤450℃Application: Small industrial boilers, low-pressure waste heat boilers, common heat exchangers, atmospheric steam drums, water treatment pressure equipment
2.2 High Strength Low Alloy Boiler Plate (Mainstream for Medium & High Pressure Boilers)
Q345R (replaced old grade 16MnR), Q370R, Q420R, Q460RQ345R minimum yield ≥345MPa, qualified for -20℃ impact test, service temperature ≤420℃Application: Power station boilers below 300MW, industrial medium & high pressure steam boilers, large waste heat steam drums, chemical heat exchange tanks; customizable Z15/Z25/Z35 lamellar tearing resistant grade and HIC hydrogen sulfide corrosion resistant version
2.3 Heat-Resistant Cr-Mo Alloy Boiler Plate (High-Temperature High-Pressure Boilers & Hydrogenation Equipment)
15CrMoR, 14Cr1MoR, 12Cr1MoVRLong-term service at 450–580℃, outstanding high-temperature creep resistance & hydrogen corrosion resistanceApplication: High-temperature headers of power stations, superheater steam drums, chemical hydrogenation boilers, cracking heating pressure-bearing cylinders
2.4 Equivalent International Export Grades
ASTM SA516 Gr60/Gr70, SA387 Gr11/Gr22EN P265GH, P355GH, 16Mo3JIS SB410, SB450
Standard Delivery Heat Treatment Status
Hot Rolled (AR), TMCP Controlled Rolling, Normalized (N), Normalized & Tempered (N+T); heavy plates, export orders and low-temperature working condition plates are mandatorily delivered under normalized state to refine grains and improve toughness.
3. Applicable Standard System
Mandatory Domestic Chinese Standards
GB/T 713-2023 Steel plates and strips for pressure equipmentGB 150 Pressure Vessels (material specification for boiler equipment design)GB/T 2970 Ultrasonic testing of heavy steel platesGB/T 709 Dimensions, shape, mass and tolerances of hot rolled steel plates and strips
International Export Standards
ASTM SA516, ASTM SA387, EN 10028, JIS G3115, EU PED pressure equipment certification
4. Complete Specification Parameters
Thickness Range: 6mm–200mm; thin plate 6–16mm, medium plate 16–60mm, heavy plate 60–120mm, customized extra-heavy plate 120–200mm available
Standard Width: 1500mm, 1800mm, 2000mm, 2200mm, 2500mm, 3000mm, 3500mm; extra-wide custom sizes supported
Standard Fixed Length: 6000mm, 8000mm, 10000mm, 12000mm; free cutting & CNC flame/plasma irregular cutting available on demand
Plate Surface Processing Types
Mill Edge Plate: As-hot-rolled edge, cost-effective for non-critical internal boiler components
Sheared Edge Plate: Four sides precision cut with accurate dimensions for core pressure-bearing parts such as steam drums and main cylinders
Shot Blasted Pre-treated Plate: Descaled surface ready for direct special anti-rust painting for boilers
Z-Direction Performance Grades: Z15, Z25, Z35, specially for high-stress heavy plate heavy groove welding positions to prevent layered tearing during welding
Dimensional Tolerance Control
Strict negative thickness tolerance control; width tolerance 0~+10mm; length tolerance 0~+50mm; straightness ≤3mm per meter, free of severe warpage and camber.
5. Complete Production Process
Hot metal pretreatment → Converter / EAF smelting → LF furnace desulfurization & deoxidation refining → VD vacuum degassing for hydrogen removal → Continuous casting wide slab → Slab cleaning & inspection → Uniform high-temperature heating in walking beam furnace → 4-high mill hot rolling / TMCP controlled rolling → Laminar cooling → Heat treatment (Normalizing / Normalizing & Tempering) → Heavy-duty straightening → 100% plate-by-plate Ultrasonic Testing (UT) → Shot blasting surface cleaning → Full dimensional & appearance re-inspection → Marking & coding of heat number, steel grade and standard → Stacking with wooden spacers → Steel strapping & warehousing
6. Mandatory Full-Range Inspection Standards (100% UT per plate, batch sampling for physical & chemical tests)
6.1 Physical & Mechanical Performance Tests
Tensile test: Yield strength, tensile strength, elongation after fracture to match allowable stress for boiler pressure design
Charpy V-notch low-temperature impact test: Graded impact test at room temperature / 0℃ / -20℃ to eliminate low-temperature brittle fracture risk
180° cold bend test: No cracks or lamination to satisfy cylinder rolling & bending forming processing
Z-direction tensile test (Z-grade plate): Measure reduction of area to evaluate lamellar tearing resistance
Full spectrum chemical analysis: Strict control over harmful impurities C, Si, Mn, S, P; low sulfur & phosphorus for on-site welding
Hardness test: Brinell HB, matching boiler welding process to avoid hardening brittleness
Special additional tests on request: HIC hydrogen induced cracking test, SSCC sulfide stress corrosion test (for waste incineration & sulfur-containing flue gas boilers)
6.2 100% Mandatory Ultrasonic Non-Destructive Testing (UT) for Special Equipment
Class Ⅰ / Ⅱ ultrasonic inspection executed per GB/T 2970 to fully detect internal lamination, white spots, shrinkage cavities, inclusions and internal cracks; plates without qualified UT reports cannot be used for manufacturing boiler pressure-bearing components.
6.3 Appearance & Dimensional Inspection
Smooth surface free of cracks, scabs, folds, pits, lamination and massive oxide scale; residual thickness after defect grinding shall not be lower than minimum standard limit; thickness, width, length and straightness measured and filed plate by plate.
7. Core Product Advantages
High-purity vacuum refined steel with high safety factor under high temperature pressureLow-hydrogen, low-sulfur & low-phosphorus clean steel substrate prevents internal defect expansion under long-term high temperature & pressure, fully compliant with special equipment safety codes.
Wide service temperature range covering all types of boilersCarbon grades applicable for medium-low temperature boilers below 450℃, Cr-Mo alloy grades stably used for ultra-high pressure boilers up to 580℃, multiple grades meeting all boiler demands.
Excellent weldability to boost boiler manufacturing efficiencyLow carbon equivalent design minimizes cold cracks and blowholes during SMAW, SAW and GMAW, stable forming for heavy-thickness cylinders of steam drums and headers.
High creep resistance, no deformation or bulging after long serviceAlloy grain refinement restrains creep deformation under alternating high-temperature loads, greatly extending boiler maintenance interval and equipment service life.
Customizable Z-direction & sulfur-resistant grades for complex corrosive environmentsZ15/Z25/Z35 eliminates lamellar tearing during T-joint welding of heavy plates; HIC sulfur-resistant versions fit waste incineration and sulfur-containing flue gas waste heat boilers.
Extra-wide plates reduce splicing welds of cylindersMax width up to 3500mm, drastically cutting splicing seams after cylinder rolling and improving tightness and structural strength of boiler barrels.
8. Main Application Fields
Thermal Power Plant Boilers (Core Application)Steam drums, water wall headers, superheaters, reheater cylinders, high & low pressure heat exchangers, waste heat recovery pressure equipment for 300MW/600MW power units
Industrial Steam BoilersChemical high-pressure steam boilers, biomass boilers, waste incineration waste heat boilers, large heating pressure boiler barrels, steam distribution drums
Petrochemical IndustryHeating furnace cylinders for hydrogenation units, cracking boilers, high-temperature heat exchange pressure vessels, oil & gas waste heat recovery equipment
Metallurgical IndustryWater-cooled components of rolling heating furnaces, metallurgical waste heat boilers, high-temperature steam circulation pressure-bearing tanks
General Pressure EquipmentHeat exchanger shells, steam buffer tanks, gas storage tanks, supporting pressure components for water treatment boilers
9. Packaging, Loading Port & Lead Time
Standard Export Seaworthy PackagingWood strips laid between plates to avoid collision damage, wooden pallets for load bearing; cross steel strapping for reinforcement, metal corner guards fitted on plate edges; full stacks wrapped with waterproof plastic film and covered with blue waterproof woven cloth for moisture & rust prevention during sea transportation.
Loading Port: Tianjin Port, shipment available via Qingdao Port and Shanghai Port.
Lead Time
Regular hot rolled stock Q245R/Q345R boiler plates: 5–7 days
High strength Q370R/Q420R plates & normalized low-temperature plates: 10–16 days
Heat-resistant 15CrMoR alloy plates, Z35 heavy plates, custom extra-heavy 120–200mm plates: 18–28 days
MOQ & SamplesMinimum order quantity 5 tons; 300×300mm test plates provided free for tensile, low-temperature impact and ultrasonic testing.
10. Supporting Special Equipment Quality Assurance Documents
Complete set of original Chinese & English factory certificates:
Slab melting chemical composition analysis report
Mechanical test report (tensile, low-temperature impact, cold bend)
100% plate-by-plate ultrasonic UT inspection report
Special Z-direction performance & HIC sulfur resistance test report (supplied on request)
Dimensional tolerance & surface appearance inspection data sheet
GB / ASME / EN original special equipment certificate, packing list, certificate of origin
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