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Main Applications SUS304 supports people's lives behind the scenes.Below are the industries and items where it is used. Shape Chemical Composition of SUS304 (JIS Standard Values) Elements C (Carbon) Si (Silicon) Mn (Manganese) P (Phosphorus) S (Sulfur) Ni (Nickel) Cr (Chromium) N (Nitrogen) Fe (Iron) Standard Values(Mass %) 0.08% or less 1.00% or less 2.00% or less 0.045% or less 0.030% or less 8.00〜10.50% 18.00〜20.00% 0.10% or less Balance Standards SUS304 has nearly equivalent materials in many international standards. Japan (JIS) JIS JIS G 4303: Stainless steel bars JIS G 4304: Hot-rolled stainless steel plates, sheets and strip JIS G 4305: Cold-rolled stainless steel plates, sheets and strip JIS G 4313: Cold-rolled stainless steel strip for springs JIS G 4309: Stainless steel wires Casting material is SCS13 (equivalent to SUS304) International Standards (Nearly equivalent to SUS304) ASTM 304, 304L, 304H (similar) AISI 304 EN 1.4301 ISO X5CrNi18-10 DIN Werkstoff Nr. 1.4301 Physical Properties Density 7.93 g/cm³ Specific Heat 0.50 kJ/(kg·K) Thermal Conductivity 16.2 W/(m·K) (at 100°C) Coefficient of Linear Expansion 17.3 × 10⁻⁶ /K (20–100°C) Electrical Resistivity 0.72 μΩ·m Young's Modulus(Modulus of Elasticity) 193 GPa Poisson's Ratio 0.30 Magnetism Basically non-magnetic (slightly magnetic with strong working) Specific Gravity Approx. 7.9 Inventory List Round Bars 外径mm（10〜100） 外径mm（105〜500） Cold Drawn (Polished) Round Bars Outer Diameter (mm)（5〜75） Outer Diameter (mm)（80〜100） Hexagonal Bars Outer Diameter (mm)（12〜80）

在庫一覧 オーステナイト系 ステンレス材 在庫 耐食性・加工性に優れ、最も一般的に使用される材料です。 形状 材質 特徴 取り扱いサイズ範囲(径) ステンレス丸材ステンレス六角棒 SUS304 汎用性が高く、幅広い用途に対応 8-500 SUS304L 16-240 SUS303 快削性に優れ、精密部品に最適 10-250 SUS316 耐食性に優れ、化学・海洋環境に対応 12-300 SUS316L 16-300 SUS304N2 高強度タイプの304系材料 12-300 SUS321 高温環境や溶接用途に適した安定化鋼 16-90 SUS347 13-100 SUS309S 高温下での耐熱性に優れる材料 19-100 SUS310S 16-100 析出硬化系 ステンレス材 在庫 熱処理により高強度化が可能な材料です。 形状 材質 特徴 取り扱いサイズ範囲(径) ステンレス丸材ステンレス六角棒 SUS630（17-4PH） 強度と耐食性を兼ね備え、機械部品に広く使用 10-300 マルテンサイト系 ステンレス材 在庫 焼入れにより高硬度を得られる材料です。 形状 材質 特徴 取り扱いサイズ範囲(径) ステンレス丸材ステンレス六角棒 SUS403 機械的強度が求められる用途 16-430 SUS420J2 高硬度で耐摩耗性に優れ、刃物・部品用途に適用 11-350 フェライト系 ステンレス材 在庫 コストと耐食性のバランスに優れた材料です。 形状 材質 特徴 取り扱いサイズ範囲(径) ステンレス丸材ステンレス六角棒 SUS430 家庭用品や建材などに幅広く使用 16-100 二相系（デュプレックス） ステンレス材 在庫 高強度と優れた耐食性を兼ね備えた材料です。 形状 材質 特徴 取り扱いサイズ範囲(径) ステンレス丸材ステンレス六角棒 SUS329J4L プラント・海洋関連設備に最適 16-300

摩擦圧接加工とは 摩擦圧接加工は、金属材料を接触加圧しながら相対運動させ発生する摩擦熱を熱源とする溶接加工で 従来の溶接接合とは異なり回転と圧力が加わり複雑な高温強加工現象を伴って圧接・接合します。 そのため、摩擦圧接加工は、溶接では出来ない接合（Ａl/Cu等）も可能な技術です。また、コストダウンにもお役に立ちます。以下に摩擦圧接のしくみを記載しています。 https://youtu.be/MK2UdSVc-gE?si=Gm7v4woRF_P3FJp5 摩擦圧接加工のプロセス 摩擦圧接の主な種類 摩擦圧接加工の特長 特徴1 高品質な接合強度 摩擦圧接は、接合に悪影響とされる突き合せ面の酸化物や吸着物は摩擦発熱中に接合面よりバリとなって外部へ押し出され、さらに強圧力をかけることによって強力な圧接・接合を実現します。 引張り強さは各母材より強く、破断する場合母材にて破断します。 特徴2 異種金属、非鉄金属の接合が可能 摩擦圧接は、従来接合不可能とされていた異種金属、非鉄金属を接合する事が出来ます。 また、鍛造品、鋳造品、プレス加工品など異なる加工品の組み合わせも可能です。 但し、素材の組み合せによって接合出来ない物があります。 引張り強さは各母材より強く、破断する場合母材にて破断します。 特徴3 材料費の節約、工数の低減を実現 摩擦圧接は、他の溶接法で必要となる開先加工、嵌合加工、突き合せ面加工等が不要である事と、異素材の接合が可能なため高価材料を必要な部分だけ使用することにより素材コストの低減が図れます。 引張り強さは各母材より強く、破断する場合母材にて破断します。 特徴4 省エネルギーで環境低負荷型の接合 摩擦圧接は、素材同士の突き合せ面にて発生する摩擦熱を有効利用するためエネルギー効率が高いので、抵抗溶接と比べ短時間で接合でき、かつ電気容量は1/5～1/20に抑える事ができます。 また、溶接棒や溶剤、ガス等が不要であるためランニングコストを大幅に低減すると共にスパッタ・ヒューム・煙の発生が無いため、人にも環境にもやさしい環境低負荷型の接合法です。 引張り強さは各母材より強く、破断する場合母材にて破断します。 摩擦圧接材料と機械加工のコラボレーション 摩擦圧接は「コストダウンのパートナー」材料→摩擦圧接→機械加工→品質検査→発送 トータルサポートにて、ご要望にお応えします。 摩擦圧接による異種金属接合 摩擦圧接加工では、ステンレス＋炭素鋼　ステンレス＋アルミ　ステンレス＋銅　チタン＋銅等、様々な異なる種類の金属同士の接合が行われており、多分野で応用されています。材料費及び加工費 軽量化のご要望があれば、ご相談に応じます。又、品質保証に於いても、ヒートサイクルテスト、超音波 探傷試験機、曲げ試験機を備えており、要求項目に於いて、引張強度比較等も対応致します。 試作品の材料から完成品までとその間の分析、解析も対応致します。 又、摩擦圧接は回転体に限定されますが、板状のワークつきましては、爆着材の見積も致します。摩擦圧接のことならお任せください。 摩擦圧接が特に向いている場面 軸もの部品の接合 異素材を高強度でつなぎたい 量産・高い再現性が必要 熱影響を最小限にしたい 溶接欠陥を避けたい

Architecture & Interior Design The Optimal Stainless Steel for Architecture & Interior Design What is demanded in architecture is not only beauty but also "strength" to be used for a long time. Stainless steel exhibits stable performance even in outdoor environments due to its properties of resisting rust and deterioration.In addition to high reliability as exterior/exterior members, its refined texture elevates the value of the space. We expand the possibilities of architecture with reliable quality and flexible processing support. Proposals by Application EquipmentApplicationCharacteristicsExterior / Structural MembersExterior wall panels / Roofing materials / Handrails & fences / Bridge membersStrong against rain and wind, resistant to rust for long periodsKeeps maintenance costs downInterior / Design MaterialsWall panels / Elevator interiors / Monuments & decorative materials / Store fixtures (counters, shelves, etc.)Diverse finishes available such as hairline and mirror polishCreates a sense of luxury and cleanlinessEquipment / Functional MembersDoor hardware (handles, hinges) / Kitchen equipment (sinks, countertops) / Piping & ductsResistant to water and moisture, highly sanitaryAlso excellent in heat and chemical resistance Mainly Used Materials and Characteristics SUS304　The most general stainless steel with a good balance of corrosion resistance, workability, and cost; widely used for both interiors and exteriors. SUS316 / SUS316L　Contains molybdenum, highly corrosion-resistant; ideal for coastal areas, exteriors, and wet areas. SUS430　Ferritic series, low cost; used for indoor applications and decorative members. SUS301 / SUS304 series (Spring applications)　Excellent strength and elasticity; used for fitting parts and structural auxiliary materials. Reasons Why Stainless Steel is Chosen Rust-resistant and long-lastingHighly decorative (Design quality)Easy to clean and sanitaryRecyclable with low environmental impact Food, Medical & Sanitary Fields The Optimal Stainless Steel for Food, Medical & Sanitary Fields Combining high corrosion resistance and cleanliness, stainless steel is an indispensable material in environments requiring sanitation management, such as food factories and medical sites. At Matsui Kozai, we consistently handle everything from optimal material selection according to the application to processing and delivery. Common ChallengesIn the food, medical, and sanitary fields, there are challenges such as the following: Want to prevent the risk of foreign matter contamination due to rust or corrosion. Want to use materials that can withstand washing and sterilization. Want to meet sanitary standards (cleanability, non-contamination). Want to choose materials highly resistant to chemicals and moisture. These challenges can be solved with stainless steel. EquipmentApplicationCharacteristicsRecommended MaterialsFood Factories / Kitchen EquipmentTanks / Piping / Workbenches / Conveyor membersRust-resistant, reducing foreign matter contamination risksStrong against washing and sterilizationComplies with food sanitation standardsSUS304 / SUS316Medical & Pharmaceutical EquipmentSurgical instruments / Medical device parts / Clean equipmentHigh corrosion and chemical resistanceEasy to suppress bacterial growthSuitable for environments requiring high cleanlinessSUS316 / SUS316LClean Environments / Sanitary EquipmentCleanroom members / Piping / Exhaust equipmentSuppresses the adhesion of dust and pollutantsHigh cleanability due to surface finishesMaintains quality even with long-term useSUS304 / SUS316L Materials Used Automobiles & Transportation Infrastructure The Optimal Stainless Steel for Automobiles & Infrastructure Combining high durability, corrosion resistance, and strength, stainless steel is adopted in a wide range of fields from automotive parts to social infrastructure. At Matsui Kozai, we consistently handle everything from optimal material proposals according to the usage environment and application to processing and delivery. Common ChallengesIn the automobile and infrastructure fields, there are challenges such as the following: Want to prevent rust and corrosion in outdoor environments. Want to balance strength and durability. Want to achieve weight reduction and high strength. Want to choose materials that can withstand long-term use. Proposals by Application EquipmentApplicationCharacteristicsRecommended MaterialsAutomotive-Related PartsMufflers / Exhaust system parts / Bolts & nuts / Spring parts / Sensor parts / Structural auxiliary materialsStrong in high-temperature environments (Heat resistance)Strength to withstand vibration and stressStrong against corrosion, long-lastingSUS304 / SUS301 / SUS430Social Infrastructure (Bridges, Civil Engineering)Bridge members / Handrails / Protective fences / Bolts & nuts / AnchorsHigh corrosion resistance even in outdoor environmentsReduction of maintenance frequencyCost benefits through long-term useSUS304 / SUS316Railway & Transportation InfrastructureRolling stock members / Interior parts / Station equipment / Platform doorsHigh durability and safetyMaintains aesthetics (rust-resistant)Maintains performance even with long-term useSUS304 / SUS301Energy & Facility InfrastructurePower generation equipment / Piping / Tanks / Water supply and sewage facilitiesCorrosion resistance against water and chemicalsStable performance even in harsh environmentsLong-term reliabilitySUS316 / SUS316L Materials Used Plants, Energy & Chemical Equipment Stainless Steel Used in the Plants & Energy Fields In the plant and energy fields, materials that can withstand harsh conditions such as high temperatures, high pressures, and corrosive environments are required. Stainless steel has excellent corrosion resistance, heat resistance, and strength, making it a vital material supporting stable operations. Proposals by Application EquipmentApplicationCharacteristicsPower Generation Plants (Thermal, Nuclear, Renewable Energy)Boiler piping / Steam lines / Heat exchangers / Turbine peripheral membersHard to deform even in high-temperature and high-pressure environments, can be used for long periodsPetroleum & Chemical PlantsPiping (fluid transportation) / Reaction vessels & tanks / Valves & fittingsPrevents corrosion by chemicals and gases, ensuring safetyHydrogen & Energy InfrastructureHydrogen station equipment / High-pressure gas piping / Fuel cell-related membersHigh strength and high durability to withstand hydrogen embrittlement and high-pressure environmentsRenewable Energy EquipmentSolar panel mounting members / Wind power generation equipment parts / Biomass plant equipmentRust-resistant even in outdoor environments, reducing maintenance costs Main Materials Used SUS304 / SUS304L　Highly versatile, widely used for piping and tanks. SUS316 / SUS316L　High corrosion resistance, strong in chemical and seawater environments. SUS310S / SUS309S　 Strong in high-temperature environments, used for boilers and furnace-related parts. SUS329J4L (Duplex Series)　High strength + corrosion resistance, applied to marine and plant piping. SUS630　Used for valves and machine parts where high strength is required. Reasons Why Stainless Steel is Chosen Rust-resistant, reducing the risk of accidents due to corrosion.Maintains performance even under high temperature and high pressure.Long-lasting, reducing the lifecycle cost of equipment.Stable supply is possible, supporting design standardization. Home Appliances & Daily Necessities Stainless Steel Used in Home Appliances & Daily Necessities In the fields of home appliances and daily necessities, visual beauty, cleanliness, and durability are required. Due to its properties of being "rust-resistant, stain-resistant, and strong," stainless steel is widely adopted as a material supporting everyday life. Main Applications EquipmentApplicationCharacteristicsKitchen Appliances & Cooking UtensilsRefrigerator interior members / Microwave oven interiors / Rice cooker inner pots (exterior members) / Pots, pans, bowlsSafe even when in contact with food; highly sanitary and heat-resistantPlumbing / Wet Area ProductsSinks / Faucets / Drainage partsHighly resistant to water, prevents rust and corrosion, can be used for a long timeHome Appliance Exteriors / Interior AppliancesExterior panels of refrigerators and washing machines / Oven and toaster exteriors / Design members for high-end appliancesRealizes a luxurious appearance through hairline and mirror finishesDaily Necessities / Household GoodsCutlery (spoons, forks) / Tumblers, bottles / Clothes drying and storage itemsStrong against scratches and impacts, durable enough to withstand repeated use Main Materials Used SUS304　The most general. Widely used for tableware, kitchen goods, and home appliance members. SUS430　For cost-saving applications (exterior panels, inside home appliances). SUS316　High-end bottles, canteens, etc., where corrosion resistance is required. SUS303　Good machinability, used for precision parts and small components. Reasons Why Stainless Steel is Chosen Rust-resistant, can be used cleanly for a long time.Resistant to dirt and easy to care for.High strength; strong even when thin.Beautiful appearance with high design quality.

Types of Processing There are various types of processing, ranging widely from machining to heat treatment. Machining Lathe Machining (General-purpose lathes, NC lathes, etc.) Drilling (Machining Center processing, etc.) Forging (Free forging, roll forging, etc.) Casting (Sand casting, lost wax, etc.) Heat Treatment Quenching and Tempering Typical heat treatments for "hardening." After heating the steel to a high temperature, it is rapidly cooled by plunging it all at once into water or oil (quenching). Because it becomes more prone to cracking as it gets harder, it is heated again at a lower temperature (tempering) to regain toughness. Widely used for parts requiring both hardness and strength, such as blades and gears. Quenching: Around 800 - 900°C Tempering: 150 - 650°C (Depending on application) Annealing A heat treatment for "softening." After heating to a high temperature, it is slowly cooled over time inside a furnace. This relieves the strain and hardness accumulated inside the steel, making it easier to process (bend, cut, etc.). It is a treatment often used as "preparation" to condition the material. Heating temperature: Around 750 - 900°C Cooling method: Slow cooling inside a furnace Normalizing A heat treatment for "eliminating unevenness." After heating to a high temperature, it is removed from the furnace and slowly cooled in the air. It resets the variations in structure caused by processing such as forging and rolling, regulating the quality uniformly. It is easy to handle without requiring special equipment, and is widely utilized to stabilize the quality of structural steel materials. Heating temperature: Around 850 - 950°C Cooling method: Natural cooling in the atmosphere Solution Annealing (Solution Heat Treatment) A heat treatment for "restoring rust resistance." By heating to a high temperature, alloy components (such as chromium) contained in the iron are uniformly dissolved, followed by rapid cooling. It restores the corrosion resistance of stainless steel that was damaged by processing such as welding. Widely used for equipment in the food, medical, and chemical fields. Heating temperature: Around 1,010 - 1,150°C Cooling method: Rapid cooling by water or air Stainless Steel Round Bar Inventory List SUS304 Peeled Round Bar Outer Diameter (mm)（10〜75） Outer Diameter (mm)（80〜） SUS304 Cold Drawn Round Bar (Polished) h9 Outer Diameter (mm)（10〜75） Outer Diameter (mm)（80〜）