How to check the quality of rolled steel when purchasing

Published December 2025

Mistakes in buying metal hit both budget and schedule: structures warp, paint blisters, the metal fails to carry the load. Fixing it later costs more than checking the documents and GOST standards in the first place.

Why check metal documents at all

Mistakes in buying metal hit both budget and schedule: structures warp, paint blisters, the metal fails to carry the load. Fixing it later costs more than checking the documents and GOST standards in the first place.

For businesses working with rolled steel in Kazakhstan, the following are especially important:

• compliance of the products with GOST or TU (technical specifications);
  
• correct certificates and passports;
  
• an honest supplier who does not cut corners on quality.
  

Below is a simple step-by-step guide for buyers.

Which documents confirm the quality of rolled steel

When purchasing, you can ask the supplier for three key sets of documents.

1. Regulatory document: GOST or TU

The first thing the documents must state is the standard to which the metal was produced:

• GOST (interstate standard);
  
• TU or ST (technical specifications of a particular manufacturer or company).
  

For example, GOST profile pipes for building structures may be manufactured to the company's own specifications while still being based on current standards such as GOST 8639-82 and GOST 13663-86.

In the documents of Hillary Assets in Kazakhstan LLP you will see references to the company's own specifications (ST TOO) and links to the relevant GOST standards. This is normal practice as long as the specifications do not lower the characteristics compared with the standard.

2. Certificates and declarations

At a minimum, ask for:

• a certificate of conformity (or a declaration of conformity) for the products;
  
• where necessary — fire safety and other special certificates (for structures with special requirements);
  
• a certificate of origin (CT-KZ form) — important if you plan to take part in tenders where local content is taken into account.
  

It is the certificates that tell you the metal has passed conformity assessment and has been legally placed on the market.

3. Quality passport / quality certificate for the metal

The third set is the metal quality passport, also known as a mill test certificate. It shows:

• steel grade;
  
• dimensions and lot;
  
• results of mechanical and chemical tests;
  
• heat and rolling numbers;
  
• references to the regulatory document.
  

This is exactly the document you will need if technical supervision or an expert review raises questions on site.

How to read certificates and passports: what you must check

Let's say you have received scans of the documents from the supplier. What should you look at first?

Step 1. Check the company details

The following must match in the certificate and the passport:

1. Name of the supplier (or manufacturer).
   
2. BIN/IIN.
   
3. Legal address.
   

If you work with Hillary Assets in Kazakhstan LLP, the details in the documents must fully match those given in the contract and on the hil.kz website. Any discrepancy is a reason to ask your manager and request a corrected set.

Step 2. Check the product description

In the quality passport for a profile pipe, pay attention to:

• product type (for example, “steel profile pipes”);
  
• size (cross-section, wall thickness, length);
  
• quantity (tonnes, pieces);
  
• lot number.
  

The description must match the commercial offer, the invoice and the actual goods in the truck.

Step 3. Look at the regulatory document

In the passport and the certificate, look for the line stating the GOST or TU — for example, GOST 8639-82, GOST 13663-86 or the specific ST TOO specifications.

What to do:

• make sure the same standard is stated in all documents;
  
• check that this particular GOST applies to the type of rolled product (pipe, sheet, long products, etc.);
  
• if in doubt, ask the supplier for a written explanation.

How to tell genuine documents from fakes

The metal market is large, and the risk of forged documentation is real. A simple check reduces it significantly.

Visual signs of authenticity

Pay attention to:

• a clear document structure with no obvious errors;
  
• a handwritten signature and the organization's seal (unless the document is fully electronic);
  
• consistent numbering (certificate number, date, lot number).
  

Fakes often have:

• a distorted logo;
  
• incorrect details of the certification body;
  
• no reference to the document on the basis of which the certificate was issued.
  

If the documents confirming rolled steel quality show blurred seals and obvious typos, it is better to request a duplicate and the original for inspection.

Checking against registers

A certificate of conformity can be checked:

1. In the open registers of certification bodies (document number and date).
   
2. By sending a request to the supplier — ask for an official letter or an electronic extract.
   

When working with a major supplier such as Hillary Assets in Kazakhstan LLP, managers usually provide links to valid certificates right away or send scans from the original source — the certification body. This reduces the risk of forgery and saves the buyer time.

Checking the delivery at the warehouse: a step-by-step checklist

Documents are only half the job. The other half is accepting the actual metal.

1. Prepare a checklist

Before unloading, make a short list:

1. Lot and heat numbers stated in the quality passport.
   
2. Dimensions: cross-section, thickness, length.
   
3. Number of packages and total weight.
   
4. Type of coating (if any: primer, zinc, etc.).
   

This checklist will help you turn rolled steel supplier verification into a repeatable procedure rather than a one-off exercise.

2. Compare the marking with the passport

Bundles or tags must show:

• product name;
  
• size;
  
• lot/heat number;
  
• weight or quantity.
  

The goal is to make sure that this particular metal comes with the rolled steel quality certificate and passport issued to you, and not with “someone else's” documents.

3. Assess the appearance

A quick visual check:

• no heavy corrosion, pits or deep dents;
  
• minimal mill scale and contamination;
  
• correct geometry (for profile pipe — straight corners and uniform wall thickness).
  

If you see serious defects, record them with photos and a discrepancy report right at acceptance.

Kazakhstan specifics: CT-KZ and local manufacturers

When dealing with public procurement and the quasi-public sector, it is important that the products qualify as domestic. To ensure this:

• check for a CT-KZ certificate of origin;
  
• verify that the certificate names the actual manufacturer and its address in the Republic of Kazakhstan;
  
• make sure the product type in the CT-KZ matches what you are buying (for example, profile pipes for building structures).
  

Hillary Assets in Kazakhstan LLP issues CT-KZ documents for profile pipes and other rolled steel in line with Kazakhstan's legal requirements, which matters for tenders and for earning local content points.

How to organize work with your supplier without unnecessary costs

So that quality control does not take up all of the buyer's time, it helps to agree on a clear procedure with the supplier.

What can be set out in the contract

• List of mandatory documents: quality passport, certificate of conformity, CT-KZ (if required).
  
• Deadlines for providing scans before shipment.
  
• Procedure for agreeing a change of grade or GOST.
  
• Procedure for filing a claim in case of discrepancies.
  

When working with Hillary Assets in Kazakhstan LLP, many of these points are already established: the company regularly supplies rolled steel in Kazakhstan for construction and industrial projects and is ready to agree the document package in advance to meet tender and technical supervision requirements.

This way you reduce the risk of downtime on site and unexpected costs of replacing metal.

Summary: a short guide for buyers

1. Before paying, request from the supplier:
   
   • passport / rolled steel quality certificate;
   • certificate of conformity;
   • CT-KZ certificate — if required.
     
2. Check: company details, product description, GOST or TU (including standards such as GOST 8639-82 and GOST 13663-86 for profile pipes).
3. When accepting goods at the warehouse, check the marking, quantity and appearance.
4. Record all key points in the supply contract.

If you want to cut risks and the time spent on checks, choose suppliers that work openly with documents and are ready to send the full package in advance — this is how Hillary Assets in Kazakhstan LLP works, supplying rolled steel to projects all over Kazakhstan.