Your project gets a claim. The steel is bad. The client wants money back. You lose profit.

To avoid project claims related to steel plate quality, check supplier qualifications before ordering, write clear specifications and rejection clauses in your contract, use third‑party pre‑shipment inspections, and document incoming inspection results carefully. These steps prevent disputes and protect your bottom line.

I am Zora Guo from cnmarinesteel.com. I have seen too many contractors lose money because of poor steel quality. The claims come from clients, class societies, or even their own yards. But most claims are avoidable. Let me show you how.

What Supplier qualification and Mill approval Checks Eliminate Risks Before Ordering?

You choose a supplier based on price. The steel arrives. It is not class approved. Your client rejects it. You are liable.

Before ordering, check that the supplier works with mills that hold current approvals from the classification societies your project requires (ABS, DNV, LR). Ask for the mill’s approval certificate. Also check the supplier’s own credentials – ISO 9001, export experience, and references. These checks eliminate the risk of receiving non‑approved or substandard steel. Do not skip them.

Let me give you a simple verification process.

Mill Approval Verification

Each class society publishes a list of approved mills on their website. You can search by mill name.

What to verify:

• Is the mill listed for the product type (plates, angles, etc.)?
• What grades are they approved for (A, AH36, DH36)?
• What thickness range is covered?
• Is the approval current (not expired)?

Red flags: Mill not on the list, approval expired, or approval only for lower grades than you need.

Supplier Credentials

The supplier (trading company or distributor) does not need mill approvals, but they should have:

• ISO 9001 certification for quality management.
• Physical office and warehouse – check Google Maps or ask for a video call.
• References from other overseas buyers. Contact them.
• Export track record to your country.

What to ask references:

• Did the steel meet specifications?
• Were mill certificates correct and complete?
• How did the supplier handle any problems?

A Real Example

A contractor in Qatar was about to order 500 tons of AH36 plates from a new supplier. The price was very low. I advised him to check the mill approval. He did. The mill was not on the ABS list. He asked the supplier for proof. The supplier sent a forged certificate. The contractor walked away. He avoided a costly claim.

Document Everything

Keep records of your verification:

• Screenshots of the mill on the class society list
• Copies of the mill’s approval certificate
• Supplier’s ISO certificate
• Email correspondence with references

If a claim comes later, you can show you did your due diligence. But the best claim is the one you prevent.

How to Write Clear Steel Plate Specifications and Rejection Clauses in Your Purchase Contract?

Your contract is vague. The steel arrives with thickness under tolerance. The supplier says it is fine. You argue. The claim goes nowhere.

Write clear specifications in your contract: thickness tolerance per class rules (e.g., -0.3mm for 12mm plate), flatness limits (bow ≤5mm/m, wave ≤3mm/300mm), grade requirements (AH36 with Charpy at 0°C), and acceptance criteria. Then add rejection clauses: the buyer can reject any plate that fails. The supplier must replace rejected plates at their cost, including expedited shipping. Without these clauses, you have no legal ground for a claim.

Let me give you exact wording you can use.

Clause 1: Material Specifications

“The steel plates shall meet the following requirements, based on ABS Rules for Building and Classing Steel Vessels (latest edition):”

• Grade: AH36 (yield strength ≥355 MPa, tensile 490‑620 MPa, elongation ≥21%, Charpy V‑notch impact ≥34 J at 0°C)
• Thickness tolerance: For plates up to 15mm, no plate shall measure more than 0.3mm below nominal thickness at any point. For plates 15‑25mm, no more than 0.4mm below.
• Flatness: Maximum bow of 5mm per meter of length. Maximum wavy edge of 3mm over 300mm.
• Surface: No laminations, scabs, pits deeper than 0.5mm, or edge cracks longer than 10mm.

Clause 2: Rejection Rights

“The buyer has the right to reject any plate that does not meet the specifications in Clause 1. Rejection shall be based on measurement by a third‑party inspector (SGS, Bureau Veritas, or a classification society surveyor) agreed by both parties. The supplier shall replace rejected plates at no cost to the buyer, including all freight and expedited shipping costs.”

Clause 3: Replacement Timeline

“If the supplier delivers non‑conforming plates, they shall ship replacement plates within 14 calendar days of receiving the rejection notice. The supplier shall pay for express shipping (air or direct truck) to minimize project delay. If the supplier fails to ship replacements within 14 days, the buyer may purchase from another source and charge the difference to the supplier.”

Clause 4: Documentary Requirements

“Each shipment shall include: (1) original mill test certificates for each heat number, stamped by the classification society; (2) a packing list showing heat numbers, dimensions, and bundle numbers; (3) a third‑party inspection report (SGS, BV, or class surveyor) confirming that all plates pass the acceptance criteria. No shipment shall leave the mill without these documents.”

Why These Clauses Work

• Clear specifications remove ambiguity. Both sides know what is acceptable.
• Rejection rights give you power.
• Replacement timeline protects your schedule.
• Documentary requirements ensure you have proof.

A Real Example

A buyer in Indonesia had a contract that only said “thickness per class rules.” The class rule gave a tolerance of -0.3mm. The plates measured 11.8mm on a 12mm nominal. The supplier said it was acceptable. The buyer disagreed. The contract had no clear rejection clause. The buyer lost the claim and had to accept the plates. After that, he added the exact wording above.

Why Are Pre‑Shipment and Third‑Party Inspections Essential to Avoid Costly Claims?

You trust your supplier. You pay. The steel arrives. It is bad. Now you file a claim. The supplier ignores you. You lose time and money.

A pre‑shipment inspection (PSI) by a third party like SGS, Bureau Veritas, or a class surveyor catches defects before you pay the final balance. The inspector measures thickness, flatness, and surface. They perform ultrasonic testing for laminations. They witness mechanical tests. If plates fail, you reject them at the mill. The supplier replaces them at their cost. You never receive bad steel. No claim is needed because the problem is solved before shipment.

Let me explain how PSI stops claims.

What a PSI Covers

For marine steel plates, a standard PSI includes:

Check	Method	What it finds
Thickness	Ultrasonic gauge at 5+ points per plate	Under‑tolerance plates
Flatness	2m straightedge	Bow or wavy edge
Surface	Visual inspection	Scabs, pits, edge cracks, rolled‑in scale
Laminations	Ultrasonic testing (UT)	Internal layers that did not bond
Mechanical properties	Witness tensile and Charpy tests	Low yield or poor toughness
Marking and documentation	Verify heat numbers against MTC	Missing or mismatched certificates

How PSI Prevents Claims

Without PSI:

1. You pay the supplier.
2. Steel ships.
3. Steel arrives bad.
4. You file a claim.
5. Supplier delays, argues, or ignores.
6. You lose time, money, and client trust.

With PSI:

1. Inspector finds bad plates at the mill.
2. You reject them before payment.
3. Supplier replaces bad plates at their cost.
4. You only pay for steel that passes.
5. No claim ever happens.

Cost vs. Benefit

A PSI for a 200‑ton order costs about $1,000‑2,000. That is 0.2‑0.5% of order value. If the inspection finds 5% bad plates, you save the cost of those plates ($8,000 for 10 tons of AH36) plus freight ($2,000) plus the claim headache.

A Real Example

A buyer in Saudi Arabia ordered 300 tons of DH36 plates. They paid for SGS pre‑shipment inspection. SGS found that 12 plates had laminations longer than 50mm. The buyer rejected those plates. The supplier replaced them from stock. The buyer received all good plates. No claim was filed. The buyer told me: “The inspection cost was $1,500. It saved us $15,000 in potential claims.”

How to Document Incoming Inspection Results and Manage Non‑Conforming Plates Without Disputes?

You receive the steel. You inspect. You find some bad plates. Now what? If you do not document properly, the supplier may dispute your findings.

Document incoming inspection results with photos, videos, and written reports. For non‑conforming plates, tag them immediately with a red sticker and move them to a quarantine area. Then send the supplier a non‑conformance report (NCR) within 24 hours, including clear evidence. Do not cut or weld the plates. Follow your contract’s rejection and replacement clauses. Proper documentation turns a potential dispute into a smooth resolution.

Let me give you a step‑by‑step process.

Step 1: Perform Incoming Inspection

Use the same measurement methods and tolerances as in your contract. For each plate, record:

• Heat number and plate ID
• Thickness readings (with photos of the gauge)
• Flatness measurements (photo of straightedge and gap)
• Any surface defects (close‑up photos with a ruler)

Step 2: Tag Non‑Conforming Plates

Use a bright red sticker or paint mark. Write “NON‑CONFORMING – DO NOT USE” and the date. Move the plates to a separate quarantine area. Take a photo of the tag and the storage location.

Step 3: Issue a Non‑Conformance Report (NCR)

Send the NCR to the supplier within 24 hours. Include:

• Purchase order number and shipment ID
• Heat numbers and plate IDs of rejected plates
• Description of each defect (thickness under, lamination, etc.)
• Photos and measurement readings
• Reference to the contract clause that defines rejection

Sample NCR wording:
“On [date], we inspected shipment [number]. Plate heat #12345 measured 11.6mm at the center. The contract requires minimum 11.7mm for 12mm nominal plate. This plate is rejected per Clause 2. Please advise within 2 days: replacement or credit.”

Step 4: Do Not Use the Plates

Do not cut, weld, or move the rejected plates to production. If you use them, you accept them. You cannot claim later.

Step 5: Follow the Contract

If your contract has a replacement timeline, hold the supplier to it. If they do not respond, escalate to senior management or your legal team.

A Real Example

A buyer in Vietnam received 50 plates of AH36. Their incoming inspection found 3 plates with edge cracks longer than 15mm. They tagged the plates, took photos, and sent an NCR to the supplier within 24 hours. The supplier replied the next day: “We will replace the 3 plates from our stock. They will ship by air within 7 days.” The buyer agreed. No dispute. The replacement plates arrived in 6 days. The project continued.

What to Avoid

• Do not wait. Send the NCR immediately. Delays make the supplier think you accepted the plates.
• Do not use the plates. Once you cut them, you lose rejection rights.
• Do not rely on memory. Document everything. Photos are proof.

Conclusion

Check supplier qualifications, write clear contract clauses, use pre‑shipment inspection, and document incoming results. These four steps prevent claims and keep your project safe.