Gray Cast Iron Rectangle Bar
Gray cast iron rectangle bar is produced from a single casting process, so it maintains consistent mechanical properties across the cross-section and does not suffer from weld-line discontinuities or heat-affected zones. This makes it suitable for applications where dimensional stability, vibration damping and machinability are critical, and where the material must hold its shape under static loads. Jialu stocks gray
- Single casting process ensures uniformity across the cross-section with no weld line or heat-affected zone
- High vibration damping and good machinability for precision machine components
- Multiple international standards available on one stock list and one purchase order
- Custom sizes and dimensions possible to match exact engineering drawings
Mill certificates issued against the ordered grade and standard. Third-party inspection available on request.
What This Material Is For
Gray cast iron rectangle bar is produced from a single casting process, so it maintains consistent mechanical properties across the cross-section and does not suffer from weld-line discontinuities or heat-affected zones. This makes it suitable for applications where dimensional stability, vibration damping and machinability are critical, and where the material must hold its shape under static loads. Jialu stocks gray cast iron bars across multiple international standards—ISO, GB, ASTM, DIN, EN, JIS, UNI, NF, AS, SS, NS, and others—so a project requiring HT250 for a machine base, GG25 for a pump housing, and EN-GJL-200 for a gear housing can be sourced on one order, one inspection and one shipment. Custom sizes are available to match the exact drawing requirements.
Why Buyers Choose It
- Single casting process ensures uniformity across the cross-section with no weld line or heat-affected zone
- High vibration damping and good machinability for precision machine components
- Multiple international standards available on one stock list and one purchase order
- Custom sizes and dimensions possible to match exact engineering drawings
- One supplier for mixed-standard bar scope avoids splitting across mills and inspection dates
Where It Is Used
- Machine tool bases and frames requiring HT250 or EN-GJL-250 for vibration damping and rigidity
- Pump and valve housings using GG20 or FGL200 where castability and machinability are key
- Industrial gearboxes and transmission housings in GG25 or FG25 for wear resistance and dimensional stability
- Foundry components and brackets in HT200 or T220 where cost and castability drive the choice
- Heavy-duty structural supports in EN-GJL-300 or FC300 where high compressive strength is needed
- Custom machine parts requiring non-standard dimensions with consistent material properties
Who It Is For
- Machine builders sourcing cast iron bars for bases, frames and housings across multiple standards
- Foundries and fabricators needing consistent gray iron bars for secondary machining
- Industrial equipment suppliers with mixed-standard drawings requiring one-source procurement
- EPC contractors managing multi-material projects where cast iron is part of the structural scope
Problems It Solves
- Splitting one bar scope across multiple mills because no single supplier covers all standards
- Delays caused by inconsistent material properties when sourcing from mills with different casting practices
- Inability to match non-standard dimensions due to limited mill capabilities
- Multiple inspection dates and shipment schedules when sourcing from separate suppliers
- Difficulty in maintaining traceability when grades are sourced from different standards and mills
Technical Features
- Cast from molten iron with controlled carbon content to achieve specified tensile strength and hardness
- Standard grades cover tensile strength from 100 MPa to 350 MPa across ISO, GB, ASTM, DIN, EN, JIS and other systems
- Available in both standard and custom dimensions, with tolerance maintained within ±1 mm for critical dimensions
- Surface finish suitable for machining without additional grinding or rework
- Material properties stable under static loading and moderate temperature service
Grades Standards And Size Range
Values below come from the published product data. Anything not listed is confirmed per enquiry.
| ISO 185 Grades | 100, 150, 200, 250, 300, 350 |
|---|---|
| China GB9439 Grades | HT100, HT150, HT200, HT250, HT300, HT350 |
| USA ASTM A48 Grades | NO.20, NO.25, NO.30, NO.35, NO.40, NO.45, NO.50, NO.55, NO.60 |
| Germany/Austria DIN 1691 Grades | GG10, GG15, GG20, GG25, GG30, GG35, GG40 |
| European EN 1561 Grades | EN-GJL-100, EN-GJL-150, EN-GJL-200, EN-GJL-250, EN-GJL-300, EN-GJL-350 |
| Japan JIS G5501 Grades | FC100, FC150, FC200, FC250, FC300, FC350 |
| Italy UNI 5007 Grades | G10, G15, G20, G25, G30, G35 |
| France NF A32-101 Grades | FGL150, FGL200, FGL250, FGL300, FGL350, FGL400 |
| Spain UNF Grades | FG15, FG20, FG25, FG30, FG35 |
| Australia AS 1830 Grades | T150, T220, T260, T300, T350, T400 |
| Sweden SS 14 01 Grades | O110, O115, O120, O125, O130, O135, O140 |
| Norway NS11 100 Grades | SJG100, SJG150, SJG200, SJG250, SJG300, SJG350 |
| Section Shape | Rectangle |
| Size | Customized |
Materials
- Gray cast iron with controlled graphite flake structure for vibration damping and machinability
- Carbon content adjusted to meet tensile strength and hardness requirements across all standard grades
- No alloying elements added; material properties driven by carbon and silicon levels
- Suitable for static load applications where ductility is not required
Manufacturing Route
Quality Control
- Chemical composition verified against the ordered grade and standard
- Mechanical property testing (tensile strength, hardness) carried out in-house with CNAS-certified laboratory
- Visual and dimensional inspection for surface defects and size compliance
- Mill certificates issued per purchase order, referencing the specified standard and grade
- Third-party inspection available on request, bookable at order stage
Customisation Options
- Custom dimensions and tolerances available upon request
- Grade and standard selected per line item, so one order can mix ISO, ASTM, DIN and EN callouts
- OEM service accepted for branded or marked bars
- Packing and marking arranged to suit destination port and inspection requirements
How It Compares With The Alternatives
| Ductile iron bar | Gray iron is cheaper and better for vibration damping; ductile iron offers higher tensile strength and ductility but costs more and is harder to machine |
|---|---|
| Wrought steel bar | Gray iron has superior vibration damping and castability; steel offers higher strength and toughness but requires machining and is more expensive |
| Aluminum alloy bar | Gray iron is heavier but more rigid and better at damping vibrations; aluminum is lighter and easier to machine but less stiff and more prone to creep |
Buying Guide
- Start from the required tensile strength and standard (e.g., HT250 or EN-GJL-250) based on the application
- Specify the exact dimensions and tolerances in the enquiry to avoid delays
- Indicate if the bar will be machined or used in static load service to select the right grade
- Send the drawing or size table with the enquiry, as availability varies by section size
- Book third-party inspection at order stage to avoid delays after production
Questions About Gray Cast Iron Rectangle Bar
Which standards of gray cast iron bar do you supply?
We supply gray cast iron bars to ISO 185, GB9439, ASTM A48, DIN 1691, EN 1561, JIS G5501, UNI 5007, NF A32-101, AS 1830, SS 14 01, NS11 100, UNF and other international standards.
Can one order include multiple standards and grades?
Yes. Mixed-standard and mixed-grade bar scope is common here, which is why buyers consolidate with us instead of splitting across mills.
Are custom sizes available?
Yes. Custom dimensions are available upon request, with tolerances maintained within ±1 mm for critical dimensions.
What certification supports the material?
The company holds ISO 9001, API Q1, PED, CE, API 5L, 5CT and 5DP, with an in-house CNAS-certified quality control laboratory. Mill certificates are issued per order.
Can we appoint our own inspector?
Yes. Third-party inspection is available on request and is best booked at order stage so the production schedule allows for it.
What payment terms and currencies do you accept?
L/C, T/T, PayPal and credit card, in USD, CAD, AUD, SGD, EUR or RMB.
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