| S.No. | Checkpoint | IS Requirement | Status |
|---|---|---|---|
| A. MTC IDENTIFICATION AND AUTHENTICITY | |||
| A1 | Verify MTC on manufacturer letterhead with unique cert number, date, and authorized signature/seal Acceptance: Letterhead, number, date, authorized signatory present; seal affixed | Cl. 18 — Certification | OK NC NA HOLD |
| A2 | Verify heat/cast number on MTC matches mill marking rolled onto bars Acceptance: Heat number rolled on bar; matches MTC and bundle tag; traceability intact | Cl. 17 — Marking | OK NC NA HOLD |
| A3 | Verify BIS/ISI mark and CM/L licence number printed on MTC and bundle tags Acceptance: Valid CM/L number; ISI mark confirmed; licence currency validated online | Cl. 17 — BIS marking | OK NC NA HOLD |
| A4 | Verify manufacturer's name rolled on bar at regular intervals (for primary steel) Acceptance: Maker's name/logo rolled on bar as raised characters; genuine primary-route steel confirmed | Cl. 17 — Rolling marks | OK NC NA HOLD |
| B. CHEMICAL COMPOSITION VERIFICATION | |||
| B1 | Verify Carbon (C) percentage on MTC for ladle analysis Acceptance: Fe 500: C ≤ 0.30%; Fe 500D: C ≤ 0.25%; Fe 550D: C ≤ 0.25%; within limits | Table 1 — Chemical composition | OK NC NA HOLD |
| B2 | Verify Sulphur (S) and Phosphorus (P) percentages on MTC Acceptance: Fe 500: S ≤ 0.055, P ≤ 0.055; Fe 500D/550D: S ≤ 0.040, P ≤ 0.040; sum S+P limited | Table 1 — S & P | OK NC NA HOLD |
| B3 | Verify Carbon Equivalent (CE) value on MTC, important for weldability Acceptance: CE ≤ 0.53 (Fe 500 weldable grades); reported CE within specification | Cl. 8 — Weldability | OK NC NA HOLD |
| B4 | For IS 2062 structural steel — verify Mn, Si, Cr, Ni and micro-alloying elements Acceptance: Reported chemistry matches grade (E 250 / E 350 etc.) chemical composition in IS 2062 | Table 1 — Structural steel chemistry | OK NC NA HOLD |
| C. PHYSICAL / MECHANICAL PROPERTIES VERIFICATION | |||
| C1 | Verify Yield Strength (0.2% proof stress) reported on MTC Acceptance: Fe 500: YS ≥ 500 MPa; Fe 500D: ≥ 500 MPa; Fe 550D: ≥ 550 MPa; reported YS exceeds minimum | Table 3 — Mechanical properties | OK NC NA HOLD |
| C2 | Verify Ultimate Tensile Strength (UTS) and UTS/YS ratio Acceptance: Fe 500D: UTS/YS ≥ 1.08; Fe 550D: UTS/YS ≥ 1.08; ductility-critical per IS 13920 | Table 3 — Strength ratio | OK NC NA HOLD |
| C3 | Verify Elongation (%) at gauge length 5.65√A Acceptance: Fe 500: ≥ 12%; Fe 500D: ≥ 16%; Fe 550D: ≥ 14.5%; Fe 600: ≥ 10% | Table 3 — Elongation | OK NC NA HOLD |
| C4 | Verify Bend and Re-bend test results on MTC Acceptance: Bar withstands specified mandrel bend (3d-8d) without cracking in bend and re-bend per IS 1599 | Cl. 9 — Bend/Re-bend | OK NC NA HOLD |
| C5 | For earthquake-prone zones — verify MTC confirms compliance to IS 13920 (Fe 500D / 550D) Acceptance: Grade D (ductile) used; YS actual/specified ≤ 1.25; UTS/YS ≥ 1.25 (as required by IS 13920) | Cl. 5.2 — Seismic steel | OK NC NA HOLD |