Odljevci od sivog željeza (EN-GJL / DIN GG / ASTM A48): Potpuni priručnik za metalurgiju, strojnu obradu i nabavu
IZVRŠNI BRZI ODGOVOR & METALURŠKI PREGLED
TECHNICAL FUNDAMENTALS & ENGINEERING SPECIFICATION MATRIX The operational capacity and fatigue life of components inside the Grey Iron Odljevci category depend upon strict adherence to international material and dimensional standards (
ISO, EN, DIN, ASTM). Below is the master specification matrix.GLOBAL SOURCING ECONOMICS & INDIAN FACTUAL BENCHMARKS (
Aqua Group / Texmo) Factual benchmark: High-precision grey iron machine tool bases and pump volutes cast via automated green sand lines in the Coimbatore Foundry Corridor (Aqua Group / Texmo). When evaluating international sourcing options for Grey Iron Odljevci, European procurement directors can reference established Indian manufacturing leaders in the Coimbatore Corridor (Aqua Group and Texmo Industries). Operating captive automated green sand molding loops (DISAMATIC 2110) coupled with multi-axis CNC horizontal machining and 100% automated pressure testing, these groups prove definitively that Indian foundries routinely deliver European zero-defect (PPM < 10) standards at a 30%+ net landed DDP savings (PIL-008 / PRO-004).
[EXECUTIVE QUICK ANSWER: GREY IRON CASTINGS] Grey Cast Iron (EN-GJL under EN 1561 / ASTM A48) contains 2.8% to 3.8% carbon precipitated as interconnected graphite flakes. While these flakes yield low elongation (<0.8%), they provide an extraordinary specific vibration damping capacity—approx. 10x higher than carbon steel and 3-5x higher than ductile iron—making EN-GJL-250 the undisputed engineering choice for machine tool beds, CNC milling bases, pump housings, and automotive brake discs.
| Standardni stupanj (EN 1561) | DIN / ASTM A48 ekvivalent | Vlačna čvrstoća Rm (MPa min) | Tipična tvrdoća (HBW) | Primarne industrijske primjene |
|---|---|---|---|---|
| EN-GJL-150 | DIN GG15 / ASTM A48 klasa 20 | 150 | 150 – 190 HBW | Lagani poklopci, nosači bez pritiska, protuutezi. |
| EN-GJL-200 | DIN GG20 / ASTM A48 klasa 30 | 200 | 170 – 210 HBW | Standardna kućišta zupčanika, niskotlačni ventili, poljoprivredna kućišta remenica. |
| EN-GJL-250 | DIN GG25 / ASTM A48 klasa 35 | 250 | 180 – 240 HBW | Heavy CNC machine tool beds, pump housings (Aqua Group benchmark), brake discs, engine blocks. |
| EN-GJL-300 | DIN GG30 / ASTM A48 klasa 45 | 300 | 210 – 260 HBW | Blokovi hidrauličkih cilindara visokog opterećenja, kućišta zupčanika za teške uvjete rada, tlačni razdjelnici. |