A357 알루미늄 주조 합금

What Is A357 Aluminum Casting Alloy?

Linsy A357 is a premium aluminum-silicon-magnesium casting alloy known for its outstanding combination of high strength, excellent weldability, and superior pressure tightness. Its fine microstructure and low iron content minimize porosity and deliver high integrity in thin-walled, highly stressed castings. Commonly supplied in the T6 temper, A357 is a preferred choice for aerospace and high-performance automotive components where fatigue resistance matters.

Available A357 Aluminum Products

Linsy supplies A357 in the forms most useful for foundries and component buyers. Standard and custom dimensions are available; contact our team for non-listed sizes.

양식	Typical Size / Specification	Common Use
Ingot	Standard ingot weights; remelt stock	Foundry remelting
Die casting	Per drawing; wall 1.5–8 mm	Complex thin-wall parts
Sand casting	Up to ~600 mm envelope	Aerospace / pump housings
Permanent-mold casting	Per drawing	Structural components
CNC-machined casting	Tolerances per ISO 2768	Finished parts

A357 Specifications & Equivalent Designations

The tables below list the alloy’s common commercial and standard designations. Cross-references follow widely used naming systems; verify the exact designation required for your target market.

규격 체계	명칭
Former / trade style	A357
AA (알루미늄 협회)	A357
EN	EN AC- series (market dependent)
ASTM	ASTM B26 / B85 (castings), B179 (ingot)

Chemical Composition of A357 Aluminum

Composition limits below follow common casting-alloy standards. Values are weight percent, balance aluminum. Confirm exact limits against your required specification.

요소	Content (wt.%)
Si	6.5–7.5
Fe	최대 0.15
Cu	최대 0.10
Mn	최대 0.10
Mg	0.45–0.70
Ti	0.10–0.20
Be	0.04–0.07 (grain refiner)
Sr	0.02–0.04 (modifier, optional)
Zn	최대 0.05
그 외, 각각	0.03 max
기타, 합계	최대 0.10
Al	나머지

열처리 상태에 따른 기계적 특성

The values below are typical room-temperature properties for the indicated condition and should be confirmed against mill test data for your specific casting and heat treatment. Casting method, section thickness, and cooling rate affect results.

성질	인장 강도(MPa)	항복 강도(MPa)	연신율 (%)
T6	310–330	245–265	3.5–5.0
T5	240–290	180–220	3.0–5.0

템퍼 선택 가이드

Choose the temper based on your priority between strength, ductility, and dimensional stability:

성질	When to Use
T6	Solution heat treated and artificially aged. Highest strength and fatigue resistance; use for highly stressed structural castings.
T5	Artificially aged only (no solution treatment). Improved strength with lower cost and distortion than T6.

Key Characteristics of A357 Aluminum

High Strength-to-Weight

A357-T6 delivers among the highest strengths available in a cast Al-Si-Mg alloy, suitable for structural aerospace and automotive parts.

Excellent Pressure Tightness

Low iron and fine microstructure reduce porosity, making A357 ideal for impellers, pump bodies, and housings under pressure.

Weldability & Fatigue

Good weldability combined with high fatigue strength supports fabricated and dynamically loaded assemblies.

일반적인 애플리케이션

• Aerospace components (impellers, housings)
• Aircraft pump parts
• High-performance automotive parts
• Compressor wheels
• Electrical components

가공 및 표면 마감 참고 사항

A357 is typically solution heat treated and aged to T6. Welding is feasible with care; post-weld heat treatment may be required to restore properties. Machining follows standard aluminum practice. Anodizing and polishing are supported for appearance and corrosion protection.

품질 문서 및 검사

Every A357 shipment is delivered with an MTC (material test certificate) covering chemical composition and mechanical properties as ordered. Dimensional inspection and third-party verification (e.g. SGS report, available on request) can be arranged. Our production system is managed under ISO 9001, ISO 14001, and ISO 45001.

Why Choose Linsy for A357 Aluminum

Linsy operates a Shenzhen-based aluminum manufacturing facility with over 20 years of experience across the 1000–8000 series and a broad range of casting grades. We support both ingot supply and finished cast components with in-house CNC machining, polishing, and anodizing.

• Custom casting method, temper, and dimension support
• MTC with every order; SGS report available on request
• CNC machining, laser cutting, polishing, and anodizing under one roof
• Responsive RFQ turnaround for engineering buyers

For A357 we emphasize melt cleanliness and low-iron practice to protect fatigue life in aerospace-grade castings.

관련 자료

• Aluminum Casting Alloy Selection Guide [VERIFY — replace with Linsy blog]
• Die Casting vs Sand Casting for Aluminum [VERIFY — replace with Linsy blog]
• Heat Treatment of Cast Aluminum Alloys [VERIFY — replace with Linsy blog]

A357 Aluminum FAQ

Is A357 better than A356?

A357 has a tighter silicon range and tighter impurity control than A356, giving more consistent strength and better weldability. Choose A357 when fatigue and pressure tightness are critical.

What temper should I specify for A357?

Specify T6 for maximum strength and fatigue resistance. Use T5 where moderate strength with lower distortion is acceptable.

주문 관련 일반적인 자주 묻는 질문

What is the typical lead time for casting alloy orders?

For standard ingot and common sand/permanent-mold castings, typical lead time is 10–60 days depending on temper, quantity, and any required machining or surface finishing. Confirm exact timing with our sales team when requesting a quote.

Do you provide mill test certificates (MTC)?

Yes. Every shipment is supplied with an MTC (material test certificate / inspection report) covering chemical composition and mechanical properties as ordered.

Can Linsy supply custom casting sizes and tempers?

We support custom dimensions, casting method selection, heat treatment (F, T4, T5, T6 as applicable), and downstream CNC machining, polishing, and anodizing. Share your drawing or spec and we will quote against it.

Which standards do your casting alloys meet?

Our casting alloys are produced and inspected against widely recognized standards such as ASTM B26/B85 and EN 1706. Specific designation cross-references are listed on each product page; confirm the exact standard requirement for your market when ordering.

How should I request a quote?

Use the RFQ form or contact our sales team with alloy, temper, form, dimensions, quantity, and required certificates. Our engineers will respond with availability and pricing.