Sivo željezo EN-GJL-250 (DIN GG25 / ASTM A48 klasa 35): Potpuni priručnik za inženjerstvo i strojnu obradu
IZVRŠNI BRZI ODGOVOR & METALURŠKI PREGLED
TECHNICAL FUNDAMENTALS & ENGINEERING SPECIFICATION MATRIX The operational capacity and fatigue life of components inside the Grey Iron Castings 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: Automated DISAMATIC green sand molding of high-precision EN-GJL-250 motor and pump volutes in Coimbatore (Aqua Group / Texmo). When evaluating international sourcing options for Grey Iron Castings, 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] EN-GJL-250 (
EN 1561/DIN GG25) is the industry standard high-tensile pearlitic grey iron. Offering a minimum tensile strength of 250 MPa, a Brinell hardness of 180-240 HBW, and 10x higher vibration damping than steel, it is the primary material for CNC machine tool beds, hydraulic housings, and automotive brake discs.
| Kemijsko/mehaničko svojstvo | Mandatory Specification Limit (EN 1561) |
Inženjerski i operativni značaj |
|---|---|---|
Tensile Strength Rm (Wall 15-30 mm) |
≥ 250 MPa | Jamči strukturnu krutost pod teškim tlačnim i umjerenim opterećenjima na savijanje. |
Brinell Hardness (HBW) |
180 – 240 HBW | Traka optimalne tvrdoće osigurava izvrstan vijek trajanja alata tijekom CNC tokarenja i glodanja bez hlađenja karbida. |
Carbon Equivalent (CE = %C + %Si/3) |
3,85 – 4,10% | Sprječava prekomjerne šupljine skupljanja tijekom eutektičkog skrućivanja unutar kalupa za zeleni pijesak. |