Gråjern EN-GJL-250 (DIN GG25 / ASTM A48 klasse 35): Komplet ingeniør- og bearbejdningshåndbog
HURTIG SVAR OG METALLURGISK OVERSIGT
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.
| Kemisk/mekanisk egenskab | Mandatory Specification Limit (EN 1561) |
Teknisk og operationel betydning |
|---|---|---|
Tensile Strength Rm (Wall 15-30 mm) |
≥ 250 MPa | Garanterer strukturel stivhed under tunge kompressions- og moderate bøjningsbelastninger. |
Brinell Hardness (HBW) |
180 – 240 HBW | Optimalt hårdhedsbånd, der sikrer fremragende værktøjslevetid under CNC-drejning og fræsning uden hårdmetalkøling. |
Carbon Equivalent (CE = %C + %Si/3) |
3,85 – 4,10 % | Forhindrer for store krympehuler under eutektisk størkning inde i grønne sandforme. |