MATERIAL DESCRIPTION 

17-4 PH is a martensitic precipitation hardening stainless steel with additions of copper (Cu), niobium (Nb) and tantalum (Ta). The grade combines high strength and hardness values with moderate corrosion resistance. Different heat treatment temperatures can optimize mechanical properties, e.g. yield strength at 1100 – 1300MPa. Our stock material is double aged at 620°C (1150°F) – defined as H1150D. 

Applications

17-4 PH provides an outstanding combination of high strength, good mechanical properties, good corrosion resistance, outstanding wear resistance and good toughness at temperatures up to 310°C. 17-4 PH is used in chemical, petrochemical, paper and general metalworking industries. Only approved by NACE for restricted components and environments.

Heat Treatment

Solution annealed at 1040°C. Double hardened/ aged at 620°C (1150°F).

Weldability

Good, Pre-heating and post-heating practices used for standard hardenable stainless grades are not required.

Chemical Composition (Specific for Bars)

Weight % C Mn P S Si Cr Ni Mo Cu Nb+Ta
Min.            15,0  3,50    3,00  0,15
Max.  0,070  1,00  0,040 0,030  0,70  17,5  5,00 0,60  5,00  0,45

Reference standards

General:

  • PED 2014/68/EU Annex I section 4.3
  • AD2000 W0

  • NACE MR0175/ ISO 15156-3 and NACE MR0103/ ISO 17945

Bars:

  • ASTM A564, EN10088-3

Mechanical Properties (Specific for Bars – Condition H1150D)

Condition Yield strength Rp0.2,
MPa
Tensile strength Rm,
MPa
Elongation
[%]
Hardness
[HB]
Impact, Charpy-V, -6ºC
[J]
Impact, Charpy-V, -46ºC
[J]
H1150D  ≥ 725  ≥ 860  ≥ 16  ≤ 311  ≥ 60  ≥ 27

Round Bar Stock

DIA KG/M
25,4 mm 4.2
31,75 mm 6.2
38,1 mm 9.2
45 mm 12.7
50,8 mm 16.2
63,5 mm 25.
76,2 mm 36.8
91 mm 52.2
101,6 mm 64.7
120,65 mm 91.7
127 mm 100.
152 mm 147
177,8 mm 200
203,4 mm 261
216 mm 294
228,6 mm 330
254 mm 402
305 mm 580
355,6 mm 797

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Equivalent standards

  • EN 1.4542
  • UNS S17400
  • AISI 630
  • 17-4 PH
Tags: Round Bar & Bored Bar