Serbuk Baja Tahan Karat OP431

Overview of Stainless Steel OP431 Powder

OP431 stainless steel belongs to the ferritic grade steels which contain chromium as the principal alloying element. The addition of aluminum enhances oxidation and corrosion resistance at high temperatures.

Key characteristics of OP431 powder include:

• Excellent oxidation and corrosion resistance up to 1150°C
• Good creep resistance and thermal fatigue strength
• Excellent thermo-mechanical stability
• High thermal conductivity and low thermal expansion
• Cost-effective compared to austenitic stainless steels
• Tersedia dalam berbagai distribusi ukuran partikel

OP431 powder is ideal for applications requiring oxidation resistance, thermal stability and moderate strength at elevated temperatures.

Chemical Composition of OP431 Powder

OP431 powder has the following nominal composition:

Chromium provides corrosion resistance while aluminum enables excellent oxidation resistance through formation of a protective alumina layer at high temperatures. Yttrium refines the grain size for additional strength.

Properties of OP431 Powder

Key properties of OP431 powder include:

The properties like high temperature strength, oxidation resistance, and thermal stability make OP431 suitable for demanding applications.

Production Method for OP431 Powder

OP431 powder can be produced via:

• Atomisasi Gas - Gas inert bertekanan tinggi yang digunakan untuk mengatomisasi paduan cair yang menghasilkan serbuk bulat halus yang ideal untuk AM.
• Atomisasi Air – High velocity water jet breaks up the molten stream producing irregular powder particles. Lower cost but higher oxygen pickup.
• Paduan Mekanis - Penggilingan bola dari serbuk unsur campuran diikuti dengan sintering dan atomisasi sekunder.

Gas atomization allows excellent control over particle size distribution, morphology, oxygen pickup and microstructure.

Applications of OP431 Powder

Typical applications of OP431 powder include:

• Manufaktur Aditif – Selective laser melting to produce complex parts needing high temperature oxidation resistance.
• Pelapis Semprot Termal – Applied via arc spraying to provide protective coatings on components operating at over 1000°C.
• Pengisi Brazing – For joining ferritic stainless steel parts in high temperature applications.
• Penyala Bahan Bakar Padat – Powder metallurgy igniter plugs used in industrial furnaces and turbines.
• Pengolahan Logam Cair – Powder metallurgy conveyor rolls, tundishes and ladles used in molten metal handling.

Specifications of OP431 Powder

OP431 powder is available under various size ranges, shapes and grades:

• Ukuran Partikel: Dari 15-45 μm untuk metode AM, hingga 150 μm untuk proses semprotan termal.
• Morfologi: Bentuk bulat, tidak beraturan dan bercampur. Bedak berbentuk bulat memiliki kemampuan mengalir yang sangat baik.
• Kemurnian: Dari tingkat kemurnian komersial hingga kemurnian tinggi berdasarkan persyaratan aplikasi.
• Kandungan Oksigen: Tingkat dipertahankan di bawah 2000 ppm untuk sebagian besar aplikasi.
• Laju Aliran: Powder can be customized for flow rates above 25 s/50 g.

Global Suppliers of OP431 Powder

Some of the major global suppliers of OP431 powder include:

• Sandvik Osprey (Inggris)
• Hoganas (Swedia)
• Produk Bubuk Tukang Kayu (AS)
• Praxair Surface Technologies (USA)
• Grup Bubuk CNPC (Tiongkok)

These companies produce various grades of OP431 powder tailored for additive manufacturing, thermal spray, powder metallurgy and other high temperature applications.

Pricing of OP431 Powder

OP431 powder is priced higher than austenitic grades but lower than exotic alloys:

• Kuantitas – $50-100 per kg for bulk orders above 500 kg. Smaller quantities are priced significantly higher.
• Kualitas - Serbuk bulat dengan kemurnian tinggi dengan karakteristik yang terkontrol menuntut harga premium.
• Pemasok - Pemasok global yang besar menawarkan harga yang kompetitif karena volume yang lebih tinggi.
• Geografi - Harga bervariasi antar wilayah dengan Eropa dan Amerika Utara sebagai pasar dengan harga yang lebih tinggi.

For critical applications, buyers should focus on quality rather than lowest cost while procuring OP431 powder.

Storage and Handling of OP431 Powder

OP431 powder requires the following storage and handling:

• Harus disimpan dalam wadah tertutup di bawah gas inert untuk mencegah oksidasi
• Hindari penumpukan serbuk halus untuk meminimalkan risiko ledakan debu
• Gunakan APD, ventilasi, grounding, dan praktik keselamatan yang tepat selama penanganan
• Mencegah kontak antara bedak dan bahan yang tidak kompatibel
• Follow safety guidelines provided by supplier SDS

Proper protective measures must be taken when handling this reactive alloy powder.

Inspection and Testing of OP431 Powder

Key quality control tests performed on OP431 powder include:

• Analisis kimia menggunakan OES atau XRF untuk memastikan komposisi berada dalam batas yang ditentukan
• Distribusi ukuran partikel sesuai standar ASTM B822
• Analisis morfologi melalui SEM
• Laju aliran bubuk diukur sesuai standar ASTM B213
• Oxygen and nitrogen content testing by inert gas fusion
• Kepadatan ditentukan oleh piknometri helium
• Microstructure characterization by XRD

Pengujian menyeluruh memastikan bubuk memenuhi karakteristik kimia, fisik, dan mikrostruktur yang diperlukan untuk aplikasi yang dimaksudkan.

Comparison Between OP431 and 316L Stainless Steel Powders

OP431 and 316L stainless steel powders are compared:

OP431 offers much better high temperature strength whereas 316L provides excellent fabrication characteristics and corrosion resistance.

OP431 Powder FAQs

Q: How is OP431 powder produced?

A: OP431 powder is commercially produced using gas atomization, water atomization, and mechanical alloying followed by sintering. Gas atomization provides the best control of powder characteristics.

Q: What are the main applications of OP431 powder?

A: Key applications include thermal spray coatings, additive manufacturing, brazing filler, powder metallurgy igniter plugs, and high temperature molten metal handling components where oxidation resistance is needed.

Q: What is the typical OP431 powder size range used in metal AM?

A: For most metal AM processes, the ideal OP431 powder size range is 15-45 microns with spherical morphology and good powder flow characteristics.

Q: Does OP431 powder require any special handling precautions?

A: Yes, it is recommended to handle this reactive powder carefully under inert atmosphere using proper ventilation, grounding, and PPE.

Q: Where can I purchase OP431 powder suitable for thermal spray coatings?

A: For thermal spray applications requiring high temperature oxidation resistance, OP431 powder can be purchased from leading manufacturers including Sandvik Osprey, Hoganas, Praxair Surface Technologies, and CNPC Powder Group.