hemical element composition of Chinese grade general strength and high strength marine steel plate FH36
FH36 Approaching Brand Lookup Table
FH36 Chemical composition
| Grade | Chemical composition (mass fraction)/% | ||||||||||||||||||||||||||||||||||
| C | Si | Mn | P | S | Cu | Cr | Ni | Nb | V | Ti | |||||||||||||||||||||||||
| FH36 | ≤0.16 | ≤0.50 | 0.90~1.60 | ≤0.020 | ≤0.020 | ≤0.35 | ＜0.20 | ≤0.80 | 0.02~0.05 | 0.05~0.10 | ≤0.02 | ||||||||||||||||||||||||
| ᵃ Grain-refining elements Al, Nb, and V can be added to steel individually or in any combination. When added individually, their content should comply with the provisions of this table; if two or more grain-refining elements are added in combination, the provisions of the lower limit of the content of grain-refining elements in the table do not apply, and Nb+V+Ti ≤ 0.12% is required. ᵇ The carbon equivalent Ceq of grades A, B, D, and E steel is less than 0.40%. The formula for calculating carbon equivalent is: Ceq = C + Mn/6. ᶜ Any other added elements should be noted in the quality certificate. ᵈ The maximum carbon content of Grade A steel shall not exceed 0.23%. ᵉ When performing impact tests on Grade B steel, the lower limit for Mn content can be as low as 0.60%. ᶠ For D and E grade steels with a thickness greater than 25 mm, the aluminum content should comply with the specifications in the table. Other grain-refining elements may be used upon consultation between the supplier and the buyer. ᵍ When the thickness of AH32 to EH40 grade steel is no more than 12.5 mm, the minimum Mn content can be 0.70%. ʰ When F-grade steel contains aluminum, the nitrogen content shall not exceed 0.012%. ⁱ The total aluminum (Alt) content can be measured instead of the acid-soluble aluminum (Als) content. In this case, the Alt content should not be less than 0.020%. |
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FH36 Mechanical properties
| Grade | Tensile test ᵃ | Charpy (V-notch) impact testᵇ | |||||||||||||||||||||||||||||||||||
| Upper yield strength (ReH)/MPa |
Tensile strength (Rm)/MPa |
Elongation after fracture (A)/% |
Test temperature/℃ | Steel plate thickness(mm)Impact absorption energy(KV₂)/J | |||||||||||||||||||||||||||||||||
| ≤50 | >50～70 | >70～150 | |||||||||||||||||||||||||||||||||||
| Vertical | Horizontal | Vertical | Horizontal | Vertical | Horizontal | ||||||||||||||||||||||||||||||||
| ≥ | |||||||||||||||||||||||||||||||||||||
| FH36 | ≥355 | 490～630 | ≥21 | -60 | 34 | 24 | 41 | 27 | 50 | 34 | |||||||||||||||||||||||||||
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ᵃ For plate tensile tests, transverse specimens are used; for profiles and bars, longitudinal specimens are used. With the agreement of both the supplier and the buyer, the tensile strength of Grade A steel sections may exceed the upper limit. ᵇ When the yield strength is not obvious, the specified plastic elongation strength Rp0.2 can be measured instead of the upper yield strength. ᶜ Impact tests are conducted only on longitudinal specimens, but the supplier must guarantee transverse impact performance; transverse impact tests are not performed on structural steel. ᵈ When delivered in a refined grain condition and normalized state, an impact test is not required. When delivered in TMCP condition, an impact test may be omitted upon mutual agreement between the supplier and the buyer. ᵉ For Grade B steel with a thickness not exceeding 25mm, impact testing may be waived upon agreement between the supplier and the buyer. |
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7.4 Mechanical Properties
7.4.1 The mechanical properties of the steel shall conform to the specifications in the table above. For ultra-high strength grade steels with properties in the thickness direction, the tensile strength in the thickness direction shall not be less than 80% of the specified minimum tensile strength.
7.4.2 When taking impact test specimens for steel with a thickness of 6 mm to <12 mm (or a diameter of 12 mm to <16 mm), small specimens of 5 mm × 10 mm × 55 mm and 7.5 mm × 10 mm × 55 mm can be taken respectively. In this case, the impact absorbed energy will be not less than 2/3 and 5/6 of the specified value, respectively. Larger specimens are preferred.
7.4.3 The impact test results of steel shall be calculated as the arithmetic mean of a set of 3 specimens. One test value is allowed to be lower than the specified value, but it shall not be lower than 70% of the specified value.
7.5 Metallographic Examination
The grain size of ultra-high strength steel should be grade 6 or finer. If the supplier can guarantee this, no inspection is required.
7.6 Surface Quality
7.6.1 The steel surface shall be free from harmful defects such as bubbles, scabs, cracks, folds, inclusions, and pressed-in iron oxide scale. The steel shall not have visually visible delamination.
7.6.2 The steel surface is permitted to have a thin layer of iron oxide scale, rust, and inconspicuous roughness, texture, scratches, and other localized defects caused by pressed-in iron oxide scale and rolling mills, provided these do not impede the inspection of surface quality. However, their depth shall not exceed 0.3 mm, and the minimum permissible thickness of the steel shall be maintained.
7.6.3 Surface defects in the steel may be removed by grinding. The cleaned area shall be smooth and without sharp edges. The thickness reduction shall not exceed 7% of the nominal thickness and not exceed 3 mm, whichever is smaller. The area of a single ground surface shall not exceed 0.25 m², and the sum of the areas of local ground surfaces shall not exceed 2% of the total area. The distance between two ground surfaces shall be greater than their average width; otherwise, they shall be considered as one ground surface. Welding repairs shall comply with the regulations of the China Classification Society. Magnetic particle testing or penetrant testing should be used to confirm that the defects have been completely removed.
7.6.4 For steel strip, since there is no opportunity to remove the defective portion of the surface, a certain degree of surface defect is permissible, but the length of the defective portion of each roll of steel strip should not exceed 6% of the total length of the steel strip.
7.7 Non-destructive testing
7.7.1 Steel plates with through-thickness properties shall be ultrasonically tested according to GB/T 2970 or other standard methods. The test methods and acceptance levels shall be specified in the contract.
7.7.2 Other steel plates may also be subject to non-destructive testing upon the buyer's request, mutual agreement between the supplier and the buyer, and specification in the contract.
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This page provides technical performance data for FH36 shipbuilding steel plate. For pricing, delivery time, certification details, or full product specifications, please return to the FH36 product page or contact us directly.
- ✔ Classification-approved FH36 shipbuilding steel plate
- ✔ EN 10204 3.1 mill test certificate
- ✔ Third-party inspection supported (SGS, BV, TUV, etc.)
- ✔ Custom dimensions and delivery coordination