Best Sellers S17400/1.4542/17-4pH Stainless Steel Tube for The Aerospace Industry 630 Seamless Pipe

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LORK GROUP CO., LTD

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17-4PH Tube/Pipe
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Seamless
Cold Drawn
Alloy Steel
Varnishing
Pipeline Transport, Boiler Pipe, Hydraulic/Automobile Pipe, Oil/Gas Drilling, Food/Beverage/Dairy Products, Machinery Industry, Chemical Industry, Mining, Construction & Decoration, Special Purpose
Round
630 Tube/Pipe
3mm - 150.0mm
1000mm - 3000mm
as Your Requirments
H9, H11, H13, K9, K11, K13 etc
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Lack, Peeled, Polishing, Bright, Sand Blast, Hl
100kgs
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LORK
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630
China
7219350000
Product Description

Product Description

Introduction

Grade 630(17-4ph) stainless steels are martensitic stainless steels that are precipitation hardened to achieve excellent mechanical properties. These steel achieve high strength and hardness following heat treatment. The heat and corrosion resistance of grade 630 are similar to that of grade 304 steels. This grades is also commonly referred to as grade 17-4PH.

One of the key benefits of this grade is that it is available in solution treated conditions, at which they can be easily machined and age-hardened to attain high strength. The age treatment of grade 630 is carried out at low temperatures, to avoid significant distortion. Therefore, this grade is used for applications such as the manufacture of long shafts that do not require re-straightening after heat treatment.


17-4pH Steel Tube Composition

The table below provides the compositional ranges of grade 17-4pH stainless steels:

Composition ranges of grade 17-4ph stainless steels


Grade


Cr


Ni


Mn


Si


P


S


Cu


Nb+Ta


630


15-17%


3-5%


1%


1%


0.040%


0.03%


3-5%


0.15-0.45%

 

17-4pH Steel Tube Grade Specification

GradeUNSDINENAMSASTMJIS
630S17400-1.4542
17-4 PH
  SUS 630

 

Possible Alternative Grades

The following table lists the possible alternative grades to 630 stainless steels:

Possible alternative grades to 630 stainless steels


Grade


Reasons for choosing 17/4PH (630)


431


431 Has higher toughness than 17/4PH. Better availability in some sizes.


416


Free-machining martensitic stainless steel - better for repetition machining. Lower cost.


316


Higher corrosion resistance of 316 to resist more severe environments, but with much lower strength than 17/4PH.


2205


Much better corrosion resistance than 17/4PH, with a lower strength (but not as low as 316).



17-4pH Steel Tube Characteristic

Corrosion Resistance

Grade 630 stainless steels have good corrosion resistance in many environments. They exhibit improved resistance against stress corrosion cracking, if aged at 550°C or more. However, grade 630 steels are less resistant to solution treated Condition A, and hence these steels, even with considerable hardness, should not be used in this condition.

Heat Resistance

Grade 630 stainless steels have good resistance to oxidation. However, long-time exposure of grade 630 to temperatures of 370 to 480°C should be avoided, to prevent loss of toughness at ambient temperature. These grades should not be used at temperatures above age-hardening temperature, to avoid reduction of hardness and mechanical properties of the metal.



17-4pH Steel Tube Processing method

Heat Treatment

Solution treatment (Condition A) - Grade 630 stainless steels are heated at 1040°C for 0.5 h, then air-cooled to 30°C. Small sections of these grades can be oil quenched.

Hardening - Grade 630 stainless steels are age-hardened at low temperatures to achieve the required mechanical properties. During the process, superficial discoloration occurs followed by shrinkage at 0.10% for condition H1150, and 0.05% for condition H900.

The table below shows the typical mechanical properties of grade 630 steels after solution treatment and age hardening:

 Typical mechanical properties of grade 630 steels achieved after solution treating

Cond.

Hardening

Typical Hardness Rockwell C

Tensile Strength (MPa)

Temp (°C)

Time (h)

A

Ann

-

36

1100

H900

482

1

44

-

H925

496

4

42

1170-1320

H1025

552

4

38

1070-1220

H1075

580

4

36

1000-1150

H1100

593

4

35

970-1120

H1150

621

4

33

930-1080

Welding

Grade 630 stainless steels can be welded using all conventional methods, and they do not require pre-heating. Care should be taken in designing and welding of high strength steels to prevent weldment stresses.

Machining

Grade 630 stainless steels can be machined in their solution-treated condition. They have machining rates similar to that of grade 304 steels.


17-4pH Steel Tube Applications

  • Valves and gears
  • Oil field equipment
  • Propeller shafts
  • Pump shafts
  • Valve spindles
  • Aircraft and gas turbines
  • Nuclear reactors
  • Paper mills
  • Chemical processing equipment
     

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