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HIC Test

HIC氢致开裂试验 Test Item

Hydrogen-Induced Cracking, HIC

Purpose

Examine the Resistance Property of Material to HIC

Test Object

Petroleum Pipeline, Pressure Vessel, Boiler, Liquid Gas Storage Tank, Valve, Flange, Weld Joint, Carbon Steel, Stainless Steel and other materials and finished products

 
 

Project Introduction

         Compared with the metal atoms, the size of hydrogen atom is much smaller, so they are very easy to spread from the gaps between the metal atoms to metal substrate, perform physical and chemical effect to the metal substrate, reduce the mechanical properties of metal substrate and cause cracks.

         The source of hydrogen can be divided into two kinds, inner hydrogen and outer hydrogen:

     (1) Inner hydrogen means that hydrogen element exist in materials before being used, and mainly introduced by smelting (water in the raw material), acid pickling (acid), electroplating (cathode hydrogen evolution), welding (not dry before welding), heat treatment (quenching etc.) and other processes.

      (2) Outer hydrogen or environmental hydrogen means that hydrogen element are absorbed when metals are in the process of use. For example, while metals are used in the environment containing H2, H2S and aqueous solution of hydrogen sulfide, hydrogen atoms generated by disintegration of H2 or H2S diffuse into components and samples.

        Under the action of hydrogen pressure, different level of the adjacent hydrogen bubble crack are interconnected to form internal cracks with ladder shape features, that is referred as hydrogen-induced cracking, and sometimes, cracks can extend to the metal surface. The occurrence of HIC also doesn’t need external stress, generally concerned with high density of large plane inclusions in steel or irregular microstructure caused by segregation of alloy elements in steels. Now hydrogen-induced cracking (HIC) is widely used to describe this type of cracking, and adopted by NACE international organization.

       Relate test:Hydrogen sulfide stress corrosion
  Test method and standard

        NACE TM0284 Evaluation of Pipeline and Pressure Vessel Steels for Resistance to Hydrogen-Induced Cracking

        GB/T 8650 Evaluation of Pipeline and Pressure Vessel Steels for Resistance to Hydrogen-Induced Cracking

HIC test diagram

HIC氢致开裂试验简图

   Sample requirements

       Size: 100mm long by 20mm wide.

        1) Thickness <30mm:parallelly sample three specimens as one set at the same product.

        2) 30mm≤ Thickness <88mm:three test specimens shall be staggered in the through-thickness direction as one set.

       3) Thickness ≥88mm: maximum test specimens shall be staggered in the through-thickness direction.

   Test equipment

HIC氢脆试验设备HIC氢脆试验样品

   Wuxi Laboratory

实验室环境

   Service process
Require
───Quick:Customer service reply consultation
 
Apply
───Standard:Fill in the application form, sign the agreement.
 
Testing
───Strictly:Strict compliance with the operating rules for the sample testing
 
Report
───Comply with the reporting procedures and ensure the accuracy of the data.
 
Archive
───Service:Archive customer's samples and contracts

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