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  6. ISONITE SQ/SQP/QPQ Process - High Durability Treatment Method

ISONITE SQ/SQP/QPQ Process - High Durability Treatment Method

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ISONITE SQ/SQP/QPQ

last updated:Jan 23, 2026

パーカー熱処理工業株式会社
パーカー熱処理工業株式会社
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Excellent performance in terms of lubrication oil deficiency, resistance to galling and seizure at high temperatures, maintenance of dimensional accuracy, and non-peeling during molding and bending processes.

The ISONITE treatment is a unique surface hardening method using low-temperature salt bath nitriding, widely applicable to carbon steel, low alloy steel, special steel, tool steel, high-speed steel, stainless steel, various cast irons, and iron-based sintered metals. The robust wear resistance created by the ISONITE treatment, the significant improvement in fatigue resistance by up to 100% in low carbon steel, the ability to withstand lubrication shortages and high-temperature wear, resistance to galling and seizure, maintenance of dimensional accuracy, and excellent performance that prevents peeling during molding and bending processes further enhance the characteristics of carbon steel, low alloy steel, special steel, tool steel, high-speed steel, stainless steel, various cast irons, and iron-based sintered metals, compensating for their shortcomings and meeting a wide range of technical demands. The ISONITE SQ, SQP, and QPQ processes are further technologically advanced processes of the ISONITE treatment. The features of the SQ, SQP, and QPQ processes include: - Resolution of pollution (wastewater) issues - Reduction of warping and distortion occurring during the cooling process - Prevention of cracking and fissures during the cooling process - Improved sliding properties due to the nitrided surface layer and oxide film - Enhanced corrosion resistance due to the nitrided surface layer and oxide film - Increased product value due to distinctive surface finish colors.

    Contract manufacturingProcessing ContractSurface treatment contract service
QPQ.jpg

ISONITE SQ/SQP/QPQ Process - High Durability Treatment Method

QPQ.jpg
QPQ.jpg
  • Related Link - https://pnk.co.jp/surface/surface1/

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basic information

■SQ Process First, preheat the workpiece to around 400°C, then immerse it in a nitride salt bath at 580°C for 10 to 180 minutes. Next, immediately transfer it to the cooling salt bath AB-1 and cool it at 350 to 400°C for 5 to 20 minutes. Finish: Non-glossy black color, excellent fatigue resistance, wear resistance, and minimal distortion. ■SQP Process After SQ, finish to the specified surface roughness using barrel, buff, or super finish. Features: High corrosion resistance, lubricity, and beautiful metallic luster. ■QPQ Process After SQP, briefly re-immerse in the oxidation salt bath AB-1. Features: Corrosion resistance greater than hard chrome plating, black luster. 【Explanation of Fatigue Strength】 - Hard chrome plating has lower fatigue strength than SAE1045. - ISONITE imparts various properties simultaneously and has features not found in other methods.

Price information

It varies depending on the type of processing and the processing process, so please feel free to contact us. *As one of our strengths, we have both the raw materials chemical division and the equipment plant division within the same company, providing an environment where all processes can be carried out consistently in-house, allowing us to offer attractive proposals for cost reduction.*

Delivery Time

Please contact us for details

※It varies depending on the type of processing and the processing process, so please feel free to contact us. Additionally, leveraging the network of our related group companies, we can also improve delivery times through outsourcing at the nearest location.

Applications/Examples of results

■ Automotive engine-related parts (four-wheel, general use) Camshaft, rocker arm shaft, distance plate, IN-valve, EX-valve, crankshaft, ACG drive gear, ACG driven gear A/B, ratchet flange, pressure plate, oil pump driven sprocket ■ Motorcycle-related parts Camshaft (cast iron), crankshaft (S48C), ACG-related gears (sintered) ■ Mechanical element parts and industrial machinery Shock absorber rod, swivel joint, synchro sprocket, cast housing, housing punching plate ■ Agricultural machinery-related (harvester, etc.) Gear shift sleeve, thresher mechanism parts ■ Aircraft-related Aircraft indexing rod ■ Construction machinery (hydraulic excavator, etc.) Arm parts, shovel drive hydraulic cylinder, joint bolts, rotating coupling parts ■ Home appliances and precision equipment parts Video recorder parts, camera parts ■ Fastening parts and general parts Clamp bolts, joint bolts (general use), check valve, thrust washer

Line up(3)

Model number overview
SQ process First, preheat the workpiece to around 400°C, then immerse it in a nitride salt bath at 580°C for 10 to 180 minutes. Next, immediately transfer it to the cooling salt bath AB-1 and cool it at 350 to 400°C for 5 to 20 minutes.
SQP process After SQ, finish to the specified surface roughness with barrel buffing and super finishing. Features: high corrosion resistance, lubricity, beautiful metallic luster.
QPQ process After SQP, briefly re-immerse in oxidation salt bath AB-1. Features: Corrosion resistance superior to hard chrome plating, black luster.

catalog(2)

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SQP, QPQ, SQ process

SQP, QPQ, SQ process

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Introduction to Contract Processing in the Surface Treatment Division

Introduction to Contract Processing in the Surface Treatment Division

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Company information

パーカー熱処理工業株式会社

パーカー熱処理工業株式会社

Manufacturing and processing contract

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The pursuit of cutting-edge technology is, at the same time, an effort to minimize the burden on the natural environment to the utmost. Our technology plays a vital role in the manufacturing process to enable coexistence with the creatures that inhabit the beautiful oceans, rivers, and mountains of this Earth. With a commitment to ecology, we, as pioneers in thermal science, are promoting the development of high-value-added products that pursue specialties such as technologies for improving mechanical functions aimed at developing pollution-free vehicles. Furthermore, through proactive business development, including multifaceted management expansion and entry into new fields of competitive product technology, we are working to stabilize our management foundation. Additionally, through technological partnerships with top leaders who possess world-class technology, we are accumulating a new sense of the era and advanced technological capabilities, earning strong trust from users around the world.

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