Does a pass here mean the plate is accepted?

No. It means the numbers you typed meet the IACS minimums. Acceptance also depends on the surveyor, the heat and plate identification on the certificate, the signatures and the contract. Use the checker to catch a bad number before it reaches the yard.

Why does it sometimes say to check aluminium, niobium and vanadium by hand?

Table 2 note 4 lets a mill use aluminium, niobium and vanadium alone or in combination. Used alone, each must reach its own minimum. Used in combination, none has to. A certificate does not say which way the mill used them, so when no element reaches its minimum but several are present the checker asks you to confirm the declared practice.

Why is the carbon equivalent only checked for some steels?

UR W11 sets carbon equivalent limits in Table 3 for thermo-mechanically rolled higher strength steel. For other conditions of supply the formula is given for information when a buyer asks for it. The checker calculates the value in both cases and applies the limit only where the standard does.

Engineering tool

Mill test certificate checker

Enter the chemistry, tensile and Charpy values from a hull steel plate certificate. The checker compares each one with IACS UR W11, tells you which values meet the standard, which do not, and which need a decision from you, and names the table behind every line.

GradeThickness (mm)Condition of supplyGrain refining elements usedTable 5 treats these two cases differently for A32, A36, D32 and D36.Aluminium reported as

Chemical composition (ladle analysis, %)

CMnSiPSAlNbVTiCuCrNiMoN

Tensile test

Yield, ReH or Rp0.2 (N/mm²)Tensile strength, Rm (N/mm²)Elongation (%)Tensile specimen

Charpy V-notch impact test

Test temperature (°C)Specimen directionSpecimen sizeValue 1 (J)Value 2 (J)Value 3 (J)

Result

Enter the plate thickness in mm.

Everything is worked out in your browser. The values you type are not sent anywhere or saved.

What this checker covers

IACS UR W11 Tables 1 to 7 for plates up to 100 mm: normal strength grades A, B, D and E, and higher strength grades A, D, E and F at strength levels 32, 36 and 40. It checks chemical composition, carbon equivalent for thermo-mechanically rolled steel, condition of supply, yield and tensile strength, elongation, and the Charpy average and individual rules of W11.6.4.

What it does not cover

Sections (UR W11 allows some relaxations for them), plates over 100 mm, Z-quality through-thickness steel, ultrasonic and surface inspection, test frequency, heat treatment records, sub-size Charpy specimens (UR W2), and the signatures, stamps and traceability that make a certificate valid. A classification society can ask for more than the IACS minimum.

Questions about checking a certificate

Does a pass here mean the plate is accepted?: No. It means the numbers you typed meet the IACS minimums. Acceptance also depends on the surveyor, the heat and plate identification on the certificate, the signatures and the contract. Use the checker to catch a bad number before it reaches the yard.
Why does it sometimes say to check aluminium, niobium and vanadium by hand?: Table 2 note 4 lets a mill use aluminium, niobium and vanadium alone or in combination. Used alone, each must reach its own minimum. Used in combination, none has to. A certificate does not say which way the mill used them, so when no element reaches its minimum but several are present the checker asks you to confirm the declared practice.
Why is the carbon equivalent only checked for some steels?: UR W11 sets carbon equivalent limits in Table 3 for thermo-mechanically rolled higher strength steel. For other conditions of supply the formula is given for information when a buyer asks for it. The checker calculates the value in both cases and applies the limit only where the standard does.

Source

Every limit was transcribed from IACS Unified Requirement W11 and checked against the published page. Rev.9 applies to ships contracted from 1 July 2018 to 31 December 2026 and Rev.10 from 1 January 2027; the tables used here carry the same values in both. The Rev.10 printing leaves out the Grade B 27 J and 20 J values and misprints the Ti limit for F grades, so Rev.9 was used for those cells. Original: IACS UR W11 (PDF)

This is a screening aid. It does not replace the review of your classification society surveyor, and it does not make a certificate valid. For hull steel plate with class certificates, contact us. Request a quote