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Help CenterSteel Sheet & Plate & Boiler Steel Plate，P265GH、P355NH、16Mo3、13CrMo4-5、10CrMo9-10
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1. Product Definition & Core Overview
Boiler steel plate refers to special hot-rolled pressure-bearing steel plate exclusive for boilers, a special heat-resistant material for special equipment. It is specially manufactured for high-temperature & high-pressure pressure components of power station boilers, industrial steam boilers and waste heat boilers, including boiler drums, headers, heads, furnace shells and heat exchangers. Operating continuously under harsh conditions of high temperature, high pressure, steam corrosion and alternating thermal load, boiler plates impose strict limits on harmful impurities such as sulfur and phosphorus compared with ordinary structural steel plates. It features stable high-temperature stress rupture strength, excellent high-temperature creep resistance, superior impact toughness at both room and low temperature, outstanding weldability and lamellar tear resistance. All products must pass mandatory impact test and full ultrasonic non-destructive testing before delivery, fully complying with special equipment safety supervision codes. The product range consists of three series: medium & room-temperature carbon boiler plates, low-alloy heat-resistant boiler plates for high temperature, and hydrogen corrosion resistant special boiler plates. Different heat treatment delivery states are available to match boilers of various temperature and pressure grades.
2. Executive Standards
2.1 Chinese National Standards
GB/T 713-2023 Steel plates for boilers and pressure vessels (core standard for boiler plates)
GB/T 2970 Ultrasonic testing for heavy steel plates
GB/T 709 Dimensions, shape, mass and tolerances of hot-rolled steel plates and strips
GB/T 30581 General technical conditions for heat treatment of steel plates for pressure equipment
2.2 International Export Standards
ASME SA515/SA515M Carbon-silicon steel plates for intermediate & high temperature boiler service
ASME SA387/SA387M Chromium-molybdenum alloy heat-resistant boiler plates (Gr11, Gr22)
EN 10028-2 European standard steel plates for high-temperature pressure equipment (P265GH, P355GH, 16Mo3)
JIS G3116 Steel plates for high-temperature structural boiler applications
3. Product Classification & Main Grades
3.1 Classification by Service Temperature
(1) Medium & Room-Temperature Carbon Boiler Plates (≤450℃)
Q245R: Basic carbon boiler plate, upgraded replacement of old grade 20G, yield strength ≥245MPa. Suitable for civil heating boilers, small low-pressure industrial steam boilers and atmospheric heat exchange equipment.
Q345R: Most widely used universal grade with balanced strength and toughness, applied to medium-pressure industrial boilers, waste heat boiler shells and common heat exchangers.
(2) Low-Alloy Heat-Resistant Boiler Plates for High Temperature (450℃~550℃)
15CrMoR, 14Cr1MoR: Cr-Mo heat-resistant material with excellent high-temperature creep strength, used for medium & high-temperature power station drums, petrochemical heating boilers and hydrogenation furnace shells.
12Cr2Mo1R, 16Mo3: High Cr-Mo alloy boiler plates, designed for high-temperature & high-pressure power station boilers and cracking heating pressure shells.
(3) Special Anti-Corrosion Boiler Plates
Q345R(HIC): Hydrogen-induced cracking resistant boiler plate, dedicated to boilers with hydrogen sulfide medium and hydrogen service conditions.
3.2 Classification by Delivery Heat Treatment Condition
TMCP Thermo-Mechanical Controlled Rolling: Standard delivery for thin & medium plates with moderate cost and uniform microstructure.
N Normalized: Grain refinement improves low-temperature impact property, standard choice for medium-heavy plates and boilers with frequent cold & hot startup/shutdown cycles.
N+T Normalized + Tempered: Eliminates rolling residual stress and delivers superior high-temperature stability, specially for thick-wall high-temperature alloy boiler plates.
Q+T Quenched & Tempered: Ultra-high strength heavy plates for large high-pressure power station boilers and heavy-duty pressure furnace shells.
4. Specification Range
Thickness: 6mm～150mm; thin plate: 6–14mm, medium plate: 14–50mm, heavy plate: 50–150mm
Width: 1500mm, 1800mm, 2000mm, 2200mm, 2500mm, custom wide width available
Length: 6000/8000/10000/12000mm, custom fixed-length cutting & precision bevel processing supported
Tolerance: GB/T 709 Class B standard tolerance; Class C high-precision tolerance optional
Density: 7.85g/cm³, delivered by theoretical weight
Surface Quality: Flat plate surface free of warpage and camber; no harmful defects including cracks, scars, folds, delaminations and bubbles. No edge lamination; remaining thickness after defect grinding meets tolerance requirements.
5. Core Mechanical Properties & Factory Inspection Standards
5.1 Typical Mechanical Performance
| Grade | Yield Strength (MPa) | Tensile Strength (MPa) | Elongation (%) | Impact Temp. | Min KV2 Impact Energy (J) | Max Service Temp. |
|---|---|---|---|---|---|---|
| Q245R | ≥245 | 400–520 | ≥25 | 20℃ | 31 | 450℃ |
| Q345R | ≥345 | 510–650 | ≥21 | 0℃ | 34 | 475℃ |
| 15CrMoR | ≥295 | 440–640 | ≥22 | 20℃ | 31 | 550℃ |
5.2 Mandatory Full Inspection Items
Tensile test, room-temperature V-notch impact test, 180° cold bending test
100% full-plate ultrasonic testing (UT), Grade Ⅰ/Ⅱ/Ⅲ inspection optional to eliminate internal lamination, slag inclusion and microcracks
Spectral chemical analysis with strictly controlled low impurities: S ≤0.010%, P ≤0.025%
Full dimensional inspection covering thickness, length, width and flatness
Additional HIC hydrogen-induced cracking test for plates used in hydrogen service equipment
6. Production Process Flow
Refined molten steel vacuum degassing & sulfur/phosphorus reduction → Continuous casting slab → Uniform heating in walking-beam furnace → Multi-stage high-pressure water descaling → Precision controlled rough & finish rolling → Laminar flow controlled cooling → Straightening & leveling → Heat treatment (TMCP/N/N+T/Q+T on demand) → Shot blasting descaling → Steel stamping marking (grade, heat batch number, standard, UT grade) → Full-coverage ultrasonic NDT → Physical & chemical sampling test → Fixed-length cutting & beveling → Anti-rust film coating → Wooden block separated packaging & warehousing
Vacuum refining sharply cuts harmful impurities, while precise controlled rolling and dedicated heat treatment stabilize high-temperature metallographic structure, greatly improving high-temperature creep resistance and fatigue resistance to guarantee safe long-term high-pressure operation of boilers.
7. Core Product Advantages vs Ordinary Carbon Steel Plates
Low harmful impurities to prevent high-temperature brittle fracture Strict limitation of sulfur and phosphorus with refined uniform grains eliminates brittle fracture and tube burst risks under alternating cold & hot startup cycles, complying with mandatory safety codes for special equipment.
Exclusive high-temperature heat-resistant performance Cr-Mo alloy grades deliver excellent long-term high-temperature strength and creep resistance, without softening or deformation under long-term service above 500℃, which cannot be replaced by ordinary carbon plates.
100% NDT with dense internal microstructure Full-plate ultrasonic inspection eliminates internal lamination defects, avoiding delamination and cracking during rolling, welding and deep forming of boiler drums and heads.
Superior weld compatibility Controlled low carbon equivalent prevents cold cracks during hot & cold welding when matched with dedicated heat-resistant welding consumables, significantly lowering rework rate for boiler fabrication.
Full quality traceability for compliance inspection Independent heat batch number for each plate, complete physical, chemical and NDT certificates available for special equipment supervision inspection, third-party acceptance and export customs clearance.
Customized materials for diversified working conditions Covers full scenarios including atmospheric, medium-high pressure, high temperature and hydrogen corrosion; ordinary carbon, Cr-Mo heat-resistant and HIC-resistant special boiler plates can be customized.
8. Main Application Fields
Thermal Power Industry High-pressure power station boiler drums, water cooling headers, superheater shells, waste heat boiler casings, high-temperature heat exchange pressure shells
Industrial Thermal Boiler Industry Factory steam boilers, heating hot water boilers, biomass boilers, oil heat carrier furnace drums and head components
Petrochemical Industry Petrochemical heating boilers, hydrogenation heating equipment, cracking furnace pressure shells, medium heat exchange boiler equipment
New Energy Supporting Equipment Solar thermal power high-temperature heat storage boilers, biomass gasification pressure furnace shells, energy storage heat exchange pressure vessels
Light Industry & Pharmaceutical Equipment Sterilization steam boilers, fermentation heating pressure tanks, food processing high-temperature heat exchange equipment
9. Processing, Welding & Operation Specifications
Matched dedicated welding consumables must be used for carbon and Cr-Mo alloy boiler plates; Cr-Mo alloy plates require strict pre-heating before welding and post-weld stress relief tempering to avoid weld cracking under high-temperature operation.
Sharp tool indentation shall be avoided during plate rolling and head spinning to prevent stress concentration and fatigue cracks under high-temperature service.
Q345R(HIC) hydrogen-resistant plates are mandatory for boilers with hydrogen sulfide and hydrogen medium; ordinary Q345R cannot be substituted.
Heavy-wall boiler shells with thickness ≥30mm require secondary ultrasonic inspection after plate delivery and equipment fabrication to confirm zero internal defects.
Regular wall thickness and metallographic inspection shall be conducted on Cr-Mo boiler components serving above 500℃ long-term to prevent high-temperature creep failure.
Hydrostatic test of finished boilers shall be carried out at 1.25 times design pressure with stable holding pressure; commissioning is permitted only with zero leakage and no plastic deformation.
10. Packaging, Certification & Customization Services
10.1 Standard Packaging
Thin plates are coated with single-side anti-rust film; medium & heavy plates are separated by wooden blocks and fully bundled with multiple steel straps. Edge protection strips are equipped to prevent collision and scratch damage during transportation. Each plate is clearly steel-stamped with material grade, dimension, heat batch number and UT grade for full production traceability. Moisture-proof rain-proof wooden pallets are adopted for export orders.
10.2 Complete Factory Certification Documents
Full set of original delivery documents: factory material certificate, spectral chemical report, tensile & impact mechanical test report, ultrasonic inspection report, cold bending test record and product qualification certificate. Third-party inspection by SGS and BV is available to meet domestic boiler supervision inspection and overseas ASME / EU pressure equipment export clearance requirements.
10.3 Customization Services
Custom non-standard thickness & extra-wide width, arbitrary fixed-length cutting, finished bevel processing and shot blasting rust removal. TMCP, normalized, normalized+tempered, quenched+tempered and HIC-resistant special delivery states are optional. Multi-standard compliance certificates (GB, ASME, EN, JIS) can be provided for global thermal and chemical boiler equipment manufacturers.
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