Gray Cast Iron Square Bar
Gray cast iron square bar is produced by casting molten iron into a mold with a square cross-section, resulting in a material that is dimensionally stable, easy to machine, and suitable for applications requiring vibration damping and wear resistance. Jialu supplies gray cast iron square bar across multiple international standards—ISO, GB, ASTM, DIN, EN, JIS, UNI, NF, AS, SS, NS, UNF, NBN and others—so a project spec
- Casting process ensures dimensional stability and minimal distortion after machining
- High vibration damping and wear resistance make it ideal for machine bases and structural frames
- Available in multiple international standards, so mixed-standard projects stay on one order
- Square section is ready for machining or assembly without additional forming
Mill certificates issued against the ordered grade and standard. Third-party inspection available on request.
What This Material Is For
Gray cast iron square bar is produced by casting molten iron into a mold with a square cross-section, resulting in a material that is dimensionally stable, easy to machine, and suitable for applications requiring vibration damping and wear resistance. Jialu supplies gray cast iron square bar across multiple international standards—ISO, GB, ASTM, DIN, EN, JIS, UNI, NF, AS, SS, NS, UNF, NBN and others—so a project specifying EN-GJL-250, HT250 or GG25 does not need to be split across mills with different standard coverage. One order, one inspection, one shipment covers mixed-grade and mixed-standard requirements.
Why Buyers Choose It
- Casting process ensures dimensional stability and minimal distortion after machining
- High vibration damping and wear resistance make it ideal for machine bases and structural frames
- Available in multiple international standards, so mixed-standard projects stay on one order
- Square section is ready for machining or assembly without additional forming
- One supplier handles grade, standard, size and export logistics, reducing coordination effort
Where It Is Used
- Machine tool bases and frames requiring vibration damping in CNC and milling machines
- Foundry and industrial equipment housings where wear resistance and dimensional stability are critical
- Pump and valve bodies in low-pressure fluid handling systems using GG25 or EN-GJL-250
- Structural supports and brackets in heavy machinery where castability and cost are key
- Industrial conveyors and gear housings using HT200 or FC200 for moderate load and wear service
Who It Is For
- Machinery manufacturers sourcing cast iron components with mixed international standards
- Industrial equipment fabricators who need square bar for machining into frames or brackets
- Foundries and machine shops requiring ready-to-machine cast iron stock for in-house production
- EPC contractors procuring structural and mechanical components with varying grade callouts
Problems It Solves
- Splitting one project across multiple mills due to mismatched standard coverage
- Delays caused by sourcing from different suppliers for different grade families
- Inconsistent material certification when using multiple domestic suppliers
- Late availability of material due to long lead times from mills with narrow standard ranges
- Increased inspection and logistics complexity when managing multiple shipments from different mills
Technical Features
- Cast from molten iron with controlled cooling to achieve specified hardness and microstructure
- Standard grades cover tensile strength from 100 MPa to 350 MPa across ISO, GB, ASTM, DIN, EN and other systems
- Square section dimensions available in custom sizes to match design requirements
- Surface finish and dimensional tolerances maintained to standard casting practices
- Material properties verified through chemical and mechanical testing per the ordered specification
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 | Square |
| Size | Customized |
| Tensile strength range | 100 MPa to 350 MPa |
| Standard coverage | ISO, GB, ASTM, DIN, EN, JIS, UNI, NF, AS, SS, NS, UNF, NBN |
Materials
- Gray cast iron with flake graphite structure, providing good damping and machinability
- Low carbon content with controlled silicon levels to promote graphite formation
- Material selected based on tensile strength and service environment, from HT100 to HT350
- Suitable for applications where vibration absorption and wear resistance are more critical than tensile strength
- Not suitable for high-tensile or impact-loaded applications; not recommended for dynamic or cyclic loading
Manufacturing Route
Quality Control
- Chemical composition checked against the ordered grade using spectrometry
- Mechanical properties tested for tensile strength and hardness per the specification
- In-house CNAS-certified laboratory performs routine testing and verification
- Mill certificates issued per the ordered standard and grade
- Third-party inspection available on request, bookable at order stage
Customisation Options
- Custom sizes available upon request, including square section dimensions
- Grade and standard selected per item, so one order can mix ISO, ASTM, DIN and EN callouts
- OEM service accepted for branding, marking and packaging
- Packing and labeling arranged to meet destination port and inspection requirements
How It Compares With The Alternatives
| Ductile iron square bar | Gray cast iron is cheaper and easier to machine, but ductile iron offers higher tensile strength and impact resistance where dynamic loads apply |
|---|---|
| Mild steel square bar | Steel has higher strength and ductility, but gray cast iron provides better vibration damping and wear resistance at lower cost for static applications |
| Aluminum square bar | Aluminum is lighter and more corrosion-resistant, but gray cast iron has superior wear resistance and damping, making it better for machine bases and heavy-duty frames |
Buying Guide
- Start from the required tensile strength and service environment to select the grade family
- Specify the exact standard (e.g., EN-GJL-250 or HT250) in the enquiry to avoid substitution
- Provide the required square section size and length to ensure availability
- For mixed-standard projects, list all required grades and standards in one enquiry
- Book third-party inspection at order stage to avoid delays after production
Questions About Gray Cast Iron Square Bar
Which international standards do you supply gray cast iron square bar to?
We supply 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, NBN 830-01 and other regional standards.
Can one order include multiple grades and standards?
Yes. Mixed-grade and mixed-standard orders are standard here. Buyers consolidate across grades and standards to avoid splitting across mills.
Are custom sizes available?
Yes. Square section dimensions can be customized to match your design requirements.
What certification backs the material?
The company holds ISO 9001, API Q1, PED, CE, API 5L, 5CT and 5DP, with an in-house CNAS-certified laboratory. Mill certificates are issued per the ordered specification.
Can we appoint our own inspector?
Yes. Third-party inspection is available on request and is best booked at order stage to allow production scheduling.
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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