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NK A36 steel plate, also written as KA36, K A36, ClassNK A36, NK Grade A36 or market name AH36, is the higher-strength hull structural steel of ClassNK (Nippon Kaiji Kyokai) Rules for the Survey and Construction of Steel Ships (IACS UR W11 higher-strength family) with 355 MPa minimum yield, 490-620 MPa tensile strength and Charpy V-notch toughness at 0°C [32°F]. In the grade name, "A" is the toughness class, and "36" refers to the strength level (historically about 36 kgf/mm²); ClassNK mill certificates commonly use the K prefix (KA36), while AH36 is the common IACS market name with "H" for higher strength. Gangsteel, a steel plate exporter, supplies NK A36 / KA36 plates cut to size for shipbuilding, offshore platforms and marine structures.
Data source: Per IACS UR W11 (ordinary/higher-strength hull structural steel) as adopted in ClassNK hull structural steel rules. Official mill/certificate grade is typically KA36 (K A36); NK A36 and AH36 name the same class on this site. Verify the current ClassNK edition before ordering.
| Element | C | Mn | Si | P | S | Al (acid sol.) |
|---|---|---|---|---|---|---|
| NK A36 / KA36, % | 0.18 max | 0.90-1.60 | 0.10-0.50 | 0.035 max | 0.035 max | 0.015 min |
| Element | Nb | V | Ti | Cu | Cr | Ni / Mo |
| NK A36 / KA36, % | 0.02-0.05 | 0.05-0.10 | 0.02 max | 0.35 max | 0.20 max | 0.40 max / 0.08 max |
Per IACS UR W11 / ClassNK (NK) hull structural steel rules (higher-strength grades). Nb, V and Al grain-refining elements may be used singly or in combination; when used in combination the individual minima do not apply. Where acid-soluble Al is not less than 0.015%, the Si minimum does not apply. Carbon equivalent: Ceq = C + Mn/6 + (Cr+Mo+V)/5 + (Ni+Cu)/15 (%).
IACS UR W11 / ClassNK rules do not separately tabulate product (check) analysis limits for higher-strength grades. When product analysis is required, the finished plate shall meet the heat limits subject to ASTM A6/A6M Table A permitted variations (same practice as other IACS societies).
| Element | Heat analysis limit | Product analysis (heat ± A6) |
|---|---|---|
| C | 0.18 max | 0.22 max |
| Mn | 0.90-1.60 | 0.81–1.72 |
| Si | 0.10-0.50 | 0.04–0.56 |
| P | 0.035 max | 0.045 max |
| S | 0.035 max | 0.045 max |
| Al (acid sol.) | 0.015 min | no A6 Table A tolerance; product value not tabulated |
| Nb | 0.02-0.05 | 0.010–0.060 |
| V | 0.05-0.10 | 0.040–0.110 |
| Ti | 0.02 max | 0.03 max |
| Cu | 0.35 max | 0.38 max |
| Cr | 0.20 max | 0.24 max |
| Ni | 0.40 max | 0.43 max |
| Mo | 0.08 max | 0.09 max |
Per IACS UR W11 / ClassNK hull structural steel rules. Product analysis applies only when specified; for a range, results may not vary both above and below it.
| Grade | Yield strength, min | Tensile strength | Elongation, min |
|---|---|---|---|
| NK A36 (KA36) | 355 MPa [51 ksi] | 490-620 MPa [71-90 ksi] | 21% |
Per IACS UR W11 / ClassNK hull structural steel rules. Yield and tensile values apply for the full thickness range covered by the grade (typically up to 100 mm for these ship plates).
| Thickness | Test temperature | Longitudinal, avg min | Transverse, avg min |
|---|---|---|---|
| t≤50 mm | 0°C [32°F] | 34 J | 24 J |
| 50<t≤70 mm | 0°C [32°F] | 41 J | 27 J |
| 70<t≤100 mm | 0°C [32°F] | 50 J | 34 J |
Per IACS UR W11 / ClassNK hull structural steel rules. Average of three full-size Charpy V-notch specimens; not more than one value below the average and none below 70% of it. Longitudinal values shown; transverse values apply when required by the rules or purchase order. Thicker plates (above 100 mm) may be supplied by agreement with adjusted impact requirements.
Deoxidation: Killed, fine-grain practice. Delivery condition: A-class (K A36 / AH36) grades may be as-rolled, controlled rolled, normalized or TMCP depending on thickness; thicker plates usually N or TMCP. Optional extras by agreement include ultrasonic testing, Z-direction (Z15/Z25/Z35) through-thickness testing and third-party ClassNK survey.
Higher-strength NK A/D/E/F 32/36/40 plates are commonly supplied from about 6 mm to 100 mm thick (up to 150 mm by agreement). Width 1500-4000 mm and length 6000-18000 mm are typical.
| Society / Standard | Equivalent grade |
|---|---|
| NK (ClassNK) | NK A36 / KA36 (AH36) |
| LR (Lloyd's Register) | LR AH36 steel plate |
| ABS | ABS AH36 steel plate |
| CCS | CCS AH36 steel plate |
| ASTM A131/A131M | ASTM A131 AH36 steel plate |
| GL | GL AH36 steel plate |
| DNV | DNV A36 steel plate |
| BV | BV AH36 steel plate |
| KR | KR A36 steel plate |
| RINA | RINA AH36 steel plate |
IACS member societies harmonize ordinary and higher-strength hull grades under UR W11; dual certification (for example NK + ABS, or NK + ASTM A131) is common when ordered that way.
It is a higher-strength hull structural steel under ClassNK (Nippon Kaiji Kyokai) Rules for the Survey and Construction of Steel Ships (IACS UR W11), with 355 MPa minimum yield, 490-620 MPa tensile strength and Charpy toughness at 0°C [32°F]. The mill certificate grade is typically KA36 (K A36); NK A36 and market name AH36 refer to the same strength/toughness class.
NK (ClassNK) is Nippon Kaiji Kyokai. The K prefix on the mill grade (KA36) is the ClassNK designation. The letter A is the toughness class (Charpy at 0°C [32°F]), and 36 is the strength level (historically about 36 kgf/mm², now 355 MPa min yield). AH36 adds "H" for higher strength in common IACS market naming.
Minimum 355 MPa (51 ksi), tensile 490-620 MPa (71-90 ksi), elongation about 21% min.
Charpy V-notch at 0°C [32°F]. Longitudinal average minima are 34 J up to 50 mm, 41 J for 50-70 mm and 50 J for 70-100 mm.
Same 355 MPa strength class. NK A36 (KA36) at 0°C [32°F]; NK D36 (KD36) at -20°C [-4°F]; NK E36 (KE36) at -40°C [-40°F]; NK F36 (KF36) at -60°C [-76°F]. Delivery condition follows the toughness letter rules.
Same A-class toughness (Charpy at 0°C [32°F]). NK A36 is strength class 36 (355 MPa min yield); NK A32 is strength class 32 (315 MPa min yield).
Requirements are essentially harmonized under IACS UR W11. ABS AH36, LR AH36, DNV A36, BV AH36 and ASTM A131 AH36 (where listed) are counterparts; dual certification is common when ordered with the required surveys.
Yes. Controlled carbon and Ceq give good weldability; preheat may be required for thick sections depending on Ceq and restraint.
A-class (K A36 / AH36) grades may be as-rolled, controlled rolled, normalized or TMCP depending on thickness; thicker plates usually N or TMCP.
Typical supply is about 6-100 mm thick (up to 150 mm by agreement), 1500-4000 mm wide and 6000-18000 mm long.
NK Grade A steel plate | NK Grade B steel plate | NK Grade D steel plate | NK Grade E steel plate | NK A32 steel plate | NK A40 steel plate | NK D32 steel plate | NK D36 steel plate | NK D40 steel plate | NK E32 steel plate | NK E36 steel plate | NK E40 steel plate | NK F32 steel plate | NK F36 steel plate | NK F40 steel plate
NK A36 / KA36 (AH36) corresponds to the same grade under the other IACS member classification societies and ASTM A131: LR AH36 steel plate, ABS AH36 steel plate, CCS AH36 steel plate, ASTM A131 AH36 steel plate, GL AH36 steel plate, DNV A36 steel plate, BV AH36 steel plate, KR A36 steel plate, RINA AH36 steel plate.
NK A36 (KA36) shipbuilding steel plate: 355 MPa yield, 490-620 MPa tensile, Charpy at 0C, chemistry and equival
NK F32 (KF32) shipbuilding steel plate: 315 MPa yield, 440-590 MPa tensile, Charpy at -60C, chemistry and equiv
Gangsteel is specialized in supplying NK extra strength steel plate in K E36,NK E36,E36 STEEL PLATE NK Grade EH
Gangsteel is specialized in supplying NK extra strength steel plate inK D36,NK D36,D36 STEEL PLATE NK Grade DH3
