PH13-8Mo precipitation hardening stainless steel

 

PH13-8Mo stainless steel, is the United States precipitation hardening stainless steel standard grade. 0Cr13Ni8Mo2Al (PH13-8Mo) steel is a double-vacuum smelting of high-strength martensitic precipitation hardened stainless steel.

 

PH13-8Mo Features and Applications:

 

The salient features of this steel are excellent fracture toughness, good transverse mechanical properties, and stress corrosion resistance in marine environments, in addition to its high strength. In order to accurately control the composition of the alloy, reduce the gas content in the steel and improve the purity of the steel, VIM 10 VAR double vacuum smelting process should be adopted in production. Due to the good overall performance of steel, it has been widely used in aerospace, nuclear reactors and petrochemical industries such as cold heading and machining fasteners, aircraft parts, reactor components and petrochemical equipment.

 

 

PH13-8Mo chemical composition:

 

Carbon C: ≤0.05

Manganese Mn: ≤1.00

Silicon Si: ≤1.00

Chromium Cr: 12.25 ~ 13.25

Ni Ni: 7.5 ~ 8.5

Phosphorus P: ≤0.01

Sulfur: ≤0.008

Molybdenum Mo: 2.0-2.5

Aluminum Al: 0.90 ~ 1.35

Nitrogen N: ≤0.01


Note:

  1. a single value unless otherwise indicated, are the highest value;
  2. for some pipe technology, some types of austenitic stainless steel nickel content must be slightly higher than the values ​​shown in the table; 
  3. The maximum content of TA is 0.10%;
  4. The highest content is 0.75%;
  5. The highest content is 0.70%

 

Process performance:


0Cr13Ni8Mo2Al (PH13-8Mo) process performance


  • Hot-working steel forging the best processing temperature range of 1170 ~ 1205 ℃. In order to obtain refined grain structure, it should have a deformation of more than 50% below 1040 ° C.
  • Cold-working This steel can be cold-rolled, cold-drawn cold-working operation, will not encounter difficulties.
  • Heat treatment heat treatment furnace atmosphere should be controlled to avoid decarburization and carburizing. Steel solution treatment and aging treatment process shown in Table 1.535 ℃ aging can get the best strength, toughness and stress corrosion resistance with Taiwan. In order to facilitate large deformation of the cold forming and provide the best machining performance, recommended over-aging treatment, namely 760 ℃ × 2h air-cooled, and then heated to 620 ℃ × 4h air-cooled, this state is called H1150-M.
  • Aging temperature of 480 ℃; b-aging temperature of 510 ℃
  • Welding This steel can be welded in the A-state and any aging conditions, without the need for preheating before welding, which is usually best with the TIG process. For <6mm thin section material, after welding without solution annealing can be carried out aging treatment. For thick section material, after multi-pass welding conditions, before aging should be carried out after welding solution treatment.

 

PH13-8Mo steel is a double-vacuum smelting of high purity martensitic stainless steel.


Like all other precipitation hardened stainless steels, they have the best corrosion resistance in a fully hardened state. Although PH13-8Mo steel is sensitive to hydrogen embrittlement at various temperatures below 565 ℃ under severe test conditions, it is very rare in actual use. Hydrogen cracking is immune to aging at temperatures above 595 ° C. In addition, this steel has an aging temperature of 595 ° C or above.


The best sulfide stress corrosion cracking resistance. Its outstanding feature is, in addition to high strength, it has excellent fracture toughness, good lateral mechanical properties and stress corrosion resistance in the marine environment. In order to accurately control the chemical composition of steel, reducing the gas content of steel, improve the purity, in the production should be used VIM + VAR double vacuum smelting process. Due to the good overall properties of steel, it has been widely used in aerospace, nuclear reactors and petrochemical industries. Such as cold heading and machining fasteners, aircraft components, nuclear reactor components and petrochemical equipment.

 

Mechanical properties:

 

Tensile strength .............................. 1010Mpa

Yield strength .................................... ... ... 825Mpa

Elongation ............................................. 17%

Section reduction rate ........................................ 65%

Hardness ................................................ 33HRC

Impact work CvJ ........................... 81 Portrait 54 Landscape