Hallraud EN-GJL-250 (DIN GG25 / ASTM A48 klass 35): täielik inseneri- ja mehaanilise töötlemise käsiraamat
Prerequisite: Tööstuslike metallvalandite ülim inseneri- ja hankimisjuhend: hallmalmi, kõrgtugeva malmi ja terasvalu käsiraamat
KIIRE VASTUS JA METALLURGIKA ÜLEVAADE
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.
| Keemilised / mehaanilised omadused | Mandatory Specification Limit (EN 1561) |
Tehniline ja operatiivne tähtsus |
|---|---|---|
Tensile Strength Rm (Wall 15-30 mm) |
≥ 250 MPa | Garanteerib konstruktsiooni jäikuse raskete surve- ja mõõdukate paindekoormuste korral. |
Brinell Hardness (HBW) |
180-240 HBW | Optimaalne kõvadusriba, mis tagab tööriista suurepärase tööea CNC-treimisel ja freesimisel ilma karbiidi jahutamiseta. |
Carbon Equivalent (CE = %C + %Si/3) |
3,85–4,10% | Hoiab ära liigse kokkutõmbumise õõnsused eutektilise tahkumise ajal roheliste liivavormide sees. |