Overview

Stainless 440C is a high-carbon martensitic stainless steel. As a martensitic stainless steel, 440C is magnetic and can be hardened by heat treatment. The high carbon content in 440C provides high hardness and strength. Despite this carbon content, the chromium content is sufficient to retain its stainless characteristics. Martensitic steels are commonly used in applications where high strength and moderate corrosion resistance is required.

Application

Valve Seats

Surgical Instruments

Bearings

Bushings

Nozzles

Structural Aircraft Parts

440 Stainless Pipe Chemical Composition

Physical Properties

Mechanical Properties Stainless Steel 440

SS440 Heat Resistance

AISI 440 has good oxidation resistance in intermittent use below 815 °C and continuous use up to 760 °C in air.

Heat Treatment of SS440

SS440 heat treatment including annealing, quenching, tempering and stress relieving, etc.

Annealing

Subcritical annealing temperature range: 675-760 ℃ (1250-1400 ℉)

Full annealing: insulation from 845-900 °C (1550-1650 ℉) to completely soaking, then furnace cooling to 790 °C, continue cooling to 595 ° C at a cooling rate of 15-25 °C/h, then air cool to room temperature.

Isothermal Annealing: heat treat to 845-900 °C, kept at 690 °C for 4 hours.

SS440 Quenching

Heat to 1010-1065 °C and quench in air or oil. To ensure maximum dimensional stability, cold treatment should be performed immediately after cooling to room temperature

Package Process

1.with plastic cap to protect both ends

2.weaving bag wrapped outside the pipe

3.then pack into wooden case.

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Company introduction

Zheheng steel is one  incorporate of manufacturer, Exporter ,consultant ,stockist company specialized in the area of stainless steel tubing , pipe fittings ,Flanges and other stainless steel grade accessories . It is one-stop-shop company ,our team have more than 20 years experience in stainless steel field ,especially in heat exchanger tubing and large diameter pipes with ultra-long, ultra-thin, ultra-thick or ultra-large various and some special-purpose projects .

After years of efforts,we now became more and more stronger , we have consist of four company respectively located in wenzhou(headquarter),lishui,chengdu city,two factorys of ss stainless pipe workshop in lishui ,another one ss pipe fittings workshop located in wenzhou ,one domestic sales company located in chengdu.

On Time, On Budget, For Over 20 Years

Our reputation is for providing competitive prices, technical services and on time deliveries for every project for over 20 years. Our inventory is computerized so our employees can respond quickly to all your requests. If a specific product is not in stock when you request it, we guarantee same day shipping or shortest lead time available.

Our regular feture products are 304/304L,316L, 321,310s,austentic serious ,duplex steel 2205 ,hastelloy c276,inconel 625 ,and super stainless steel 904L , All of our products meet or exceed AISI/ASTM A213 ,A269,A312,EN 10216,GHOST 9941 ,GB,JIS standard. per your specific requirements and include full documentation.

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