Сив чугун EN-GJL-250 (DIN GG25 / ASTM A48 клас 35): Пълен наръчник за инженерство и обработка
ИЗПЪЛНИТЕЛЕН БЪРЗ ОТГОВОР И МЕТАЛУРГИЧЕН ПРЕГЛЕД
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 (
AQUASUB / TEXMO) Factual benchmark: Automated DISAMATIC green sand molding of high-precision EN-GJL-250 motor and pump volutes in Coimbatore (Aquasub/Texmo). When evaluating international sourcing options for Grey Iron Castings, European procurement directors can reference established Indian manufacturing leaders in the Coimbatore Corridor (Aquasub Engineering / Aquagroup 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.
| Химически/механични свойства | Mandatory Specification Limit (EN 1561) |
Инженерно и оперативно значение |
|---|---|---|
Tensile Strength Rm (Wall 15-30 mm) |
≥ 250 MPa | Гарантира структурна твърдост при тежки натоварвания на натиск и умерени натоварвания при огъване. |
Brinell Hardness (HBW) |
180 – 240 HBW | Оптимална лента за твърдост, осигуряваща отличен живот на инструмента по време на CNC струговане и фрезоване без охлаждане на карбида. |
Carbon Equivalent (CE = %C + %Si/3) |
3,85 – 4,10% | Предотвратява прекомерно свиване на кухини по време на евтектично втвърдяване във формите със зелен пясък. |