Kumar IronUpdated
In this guide
What an MTC is
A mill test certificate (MTC, also called a test certificate or TC) lists the results of tests the steel mill did on bars from a specific heat, which is one furnace batch of steel. It is issued by the manufacturer, not the dealer.
Ask for it when you buy, especially for slabs, columns and any job where an engineer is involved. A dealer who stocks branded bars should be able to provide it for the lot you are buying.
The fields to look at
| Field | What it tells you | What to check |
|---|---|---|
| Heat or cast number | The steel batch the bar came from | Should match the number rolled or tagged on your bars |
| Grade and size | For example Fe500D, 12 mm | Must match what you ordered |
| Yield strength (YS) | Stress where the bar starts to stretch permanently | At or above the grade minimum (500 N/mm² for Fe500 grades) |
| Ultimate tensile strength (UTS) | Highest stress before breaking | Above the grade minimum, and in the right ratio to YS |
| Elongation | How much the bar stretches before breaking | At or above the minimum for the grade |
| Chemistry | Carbon, sulphur, phosphorus, carbon equivalent | Within the limits of IS 1786 for the grade |
| Mass per metre | Actual weight | Within tolerance of the nominal weight |
| Standard and licence | IS 1786 and the BIS licence number | Should be stated |
For the actual minimum values of each grade, see our Fe500 vs Fe500D vs Fe550D guide. Do not rely on numbers copied by the dealer, compare against that table or the IS 1786 text.
Reading the numbers
- Yield and UTS: a good bar clears both minimums with a small margin. A result sitting exactly on the minimum for every sample is a little suspicious.
- Elongation: this is what separates Fe500 from Fe500D. Ductile bars bend and stretch more before breaking, which matters in earthquake zones like Amroha and Moradabad.
- Chemistry: sulphur and phosphorus should be low, since they make steel brittle. Carbon equivalent shows how weldable the bar is. You do not need to calculate it, just check it is within the stated limit.
Match the certificate to the bars
An MTC is only useful if it belongs to your steel. Bars are normally rolled with markings, usually the maker's name or logo and the grade, repeated along the length. Some mills also tag each bundle with a heat number.
Check that the brand on the bars matches the brand on the certificate, the size and grade match, and the heat number on the bundle tag appears on the MTC. If the bundle has no tag, ask the dealer which heat the lot belongs to.
How to spot a fake or copied certificate
- No heat number, or the same certificate handed out for different sizes and grades.
- Photocopy or screenshot with no stamp, signature, or issue date.
- Test values that look identical across several certificates, or round numbers with no spread.
- Mill name or address that does not match the bars, or a BIS licence number you cannot verify.
- Date that is long before the lot was produced, or after delivery.
If something looks off, ask the manufacturer's regional office to confirm the certificate number. You can also get a bar tested at an NABL accredited lab, which costs less than fixing a failed slab.
When to ask the store
You do not need an MTC for a small repair, but for a house slab, an RCC column or a boundary wall with pillars it is worth asking. Call or WhatsApp us with the brand and size and we will tell you what documents the lot comes with.
Frequently asked questions
- What is a heat number?
- It identifies one furnace batch of steel. All bars from that batch share the same chemistry and similar mechanical properties.
- Does every dealer give an MTC?
- Branded steel normally has one per lot. Unbranded or re-rolled bars often do not.
- Is the MTC enough to prove the bars are good?
- It proves what the mill tested, not that your bundle is that steel. Match the heat number and brand, and still check weight on site.
- Can I get my own test done?
- Yes, at an NABL accredited lab. Take 3 samples of about 1 m each from different bars.