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High Hardness 440A Stainless Steel Hexagonal Round Bar Hairline Finsh

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High Hardness 440A Stainless Steel Hexagonal Round Bar Hairline Finsh

High Hardness 440A Stainless Steel Hexagonal Round Bar Hairline Finsh
High Hardness 440A Stainless Steel Hexagonal Round Bar Hairline Finsh High Hardness 440A Stainless Steel Hexagonal Round Bar Hairline Finsh High Hardness 440A Stainless Steel Hexagonal Round Bar Hairline Finsh High Hardness 440A Stainless Steel Hexagonal Round Bar Hairline Finsh

Large Image :  High Hardness 440A Stainless Steel Hexagonal Round Bar Hairline Finsh

Product Details:
Place of Origin: China
Brand Name: DELTA
Certification: ISO 9001
Model Number: 201 304 316l 410 420 431 440 630.etc
Payment & Shipping Terms:
Minimum Order Quantity: 500 kgs
Price: 1600 - 4200 USD/Kg
Packaging Details: packing for export
Delivery Time: 5 - 12 days based on the quantity
Payment Terms: L/C, T/T, Western Union
Supply Ability: 20 Ton / Month

High Hardness 440A Stainless Steel Hexagonal Round Bar Hairline Finsh

Description
Products: Stainless Steel Hexagonal Bar Grade: 201 304 316l 410 420 431 440 630.etc
Diameter: S4 - S70 Length: 4 - 6m As Request
Surface: Bright Process: Cold Drawn
Service: Cutting MOQ: 500 Kgs
Loading Port: Shanghai , China Other Shape: Round , Square , Angle , Channel , Flat.etc
High Light:

hairline finsh SS Hexagonal Bar

,

440A SS Hexagonal Bar

,

High Hardness Stainless Steel Hexagonal Bar

High Hardness 440A 440B 440C Stainless Steel Hexagonal Bar / Stainless Steel Hex Bar

 

Product Description:

 

Product Name stainless steel hexagon bar
Standard JIS, AISI, ASTM, GB, DIN
Size Diameter : S6-S65mm or as request
Length Normal long 4M, Or as your request
Surface Bright ,hairline finsh
Technics cold drawn and polishing
Mainly Grade 201 303 304 304L 316L 410 420 431 440(A B C) 17-4PH.etc
Application construction field, ships building industry, petroleum & chemical industries, war and electricity industries, food processing and medical industry, boiler heat exchanger, machinery and hardware fields ,etc.
Packing Export standard or as customers' requirement
Delivery time Within 15 working days, according to customers' quantities
Payment L/C or T/T
MQQ 1 Ton
Quality High Quality.SGS inspection is accepted if needed
Productivity 500 Tons/Month
Attention We will supply you good quality and bottom price and first-class service in china and hope to be your golden supplier

 

Size of our hexagon stainless steel bar in stock:

 

201 304 316L stainless steel hexagon bar
Size S6 S8 S10 S11 S12 S13 S14 S15 16 S17 S18 S19 S20 S21 S22 S24 S25 S26 S28 S29 S30 S31 S32 S33 S36 S38 S40 S41 S42 S46 S50 S55 S60 S65

 

Grade 440C stainless steels are high carbon steels, which attain the highest hardness, wear resistance and strength of all stainless steel grades after heat treatment. These properties make this grade suitable for applications such as valve components and ball bearings. Grade 440A and 440B stainless steels, on the other hand, have similar properties - except for a slightly lower percentage of carbon in grade 440A.

All three forms of grade 440 steels are commonly used. However, grade 440C is more readily available than the other standard grades. Grade 440F, a free-machining type of grade 440 series, is also available with a high carbon content similar to that of grade 440C. Martensitic steel grades are high-hardness steels, usually fabricated using techniques that require hardening and tempering treatments.

These grades have a corrosion resistance lower than that of other austenitic grades. The applications of martensitic steels are limited by the loss of strength caused by over-tempering at high temperatures, and loss of ductility at temperatures below zero.

Key Properties

The following section discusses the properties of grade 440 bar products covered under ASTM A276. These values may not be similar to that of other forms such as forgings and plates.

Composition

The chemical compositions of various elements of grade 440 stainless steels are tabulated below:

Table 1. Chemical composition ranges of grade 440 stainless steels

Grade C Mn Si P S Cr Mo Ni N
440A

min.

max.

0.6

0.75

-

1

-

1

-

0.04

-

0.03

16

18

-

0.75

- -
440B

min.

max.

0.75

0.95

-

1

-

1

-

0.04

-

0.03

16

18

-

0.75

- -
440C

min.

max.

0.95

1.20

-

1

-

1

-

0.04

-

0.03

16

18

-

0.75

- -

Mechanical Properties

Table 2. Mechanical properties of grade 440C stainless steels

Tempering Temperature (°C) Tensile Strength (MPa) Yield Strength 0.2% Proof (MPa) Elongation (% in 50mm) Hardness Rockwell (HR C) Impact Charpy V (J)
Annealed* 758 448 14 269HB max# -
204 2030 1900 4 59 9
260 1960 1830 4 57 9
316 1860 1740 4 56 9
371 1790 1660 4 56 9

* Annealed properties are typical for Condition A of ASTM A276# Brinell hardness is ASTM A276 specified maximum for annealed 440A, B and C.

Physical Properties

The following table outlines the physical properties of grade 440 stainless steels:

Table 3. Typical physical properties of grade 440 stainless steels

Grade Density (kg/m3) Elastic Modulus (GPa) Mean Coefficient of Thermal Expansion (μm/m/°C) Thermal Conductivity (W/m.K) Specific Heat
0-100°C (J/kg.K)
Electrical Resistivity (nΩ.m)
0-100°C 0-200°C 0-600°C at 100°C at 500°C
440A/B/C 7650 200 10.1 10.3 11.7 24.2 - 460 600

Grade Specification Comparison

Grade specifications for 440 stainless steels are given in the following table:

Table 4. Grade specifications of grade 440 stainless steels

Grade UNS No Old British Euronorm Swedish SS Japanese JIS
BS En No Name
440A S44002     - -   SUS 440A
440B S44003     1.4112 X90CrMoV18   SUS 440B
440C S44004 - - 1.4125 X105CrMo17 - SUS 440C

Possible Alternative Grades

Suitable alternatives to grade 440 stainless steels are listed in the table below:

Table 5. Possible alternative grades to 440 stainless steels

Grade Reasons for choosing 440C
440A/B Slightly softer and more corrosion resistant grade needed
440F High machinability required, with same hardness and hardenability as 440C
420 Lower strength and hardness needed than any of the 440 grades
416 Higher machinability required, and the much lower hardness and strength is still adequate

Corrosion Resistance

Grade 440 stainless steels exhibit excellent resistance to mild acids, alkalis, foods, fresh water and air. A smooth polished surface also helps grade 440 steels resist corrosion in tempered, passivated and hardened conditions.

Grade 440C steels exhibit corrosion resistance similar to that of grade 304 steels.

Heat Resistance

Grade 440 stainless steels should not be used at temperatures below the relevant tempering temperature, due to loss of mechanical properties caused by over-tempering.

Heat Treatment

Annealing — Grade 440 stainless steels are full annealed at 850 to 900°C, followed by slow furnace-cooling at about 600°C and air-cooling. Sub-critical annealing is carried out at 735 to 785°C, followed by slow furnace-cooling.

Hardening — Grade 440 stainless steels are heated at 1010 to 1065°C, then quenched in air or oil. Oil quenching is usually carried out for heavy sections. Following this process, these steels are tempered at temperatures from 150 to 370°C, to achieve a high hardness and improved mechanical properties.

Tempering at temperatures between 425 and 565°C should be avoided as the corrosion and impact resistance properties of grade 440 tend to reduce in this range. Also, tempering of these grades at 590 to 675°C will result in high impact resistance and loss of hardness.

Welding

During welding, grade 440 stainless steels are pre-heated at 250°C, followed by full annealing. Grade 420 filler rods can be used to achieve a high hardness weld. Grade 309 or 310 filler rods will, however, provide soft welds, having high ductility.

Machining

Grade 440 stainless steels can be easily machined in their annealed state. Machining these grades after hardening is extremely difficult, or impossible in some cases.

Applications

Grade 440 stainless steels find applications in the following:

  • Chisels
  • Surgical equipment
  • High quality knife blades
  • Valve seats
  • Rolling element bearings

Service:

 

Cutting our bars into any length. Cutting side is smooth without burr.

 

 

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