SSC HIC test for SA 516-70N

[David403]

One of our customers wants the additional requirements for SA 516-70N materials. But I can not find any dealer or mill can offer it.
1. Are these SSC and HIC test method suitable for SA 516-70N?
2. Are these requirements difficult to meet for SA 516-70N?
3. Is there any one can provide some test result about SSC, HIC for SA 516-70N using the flowing method?

------ FOLLOWINGS ARE MATERIALS SPECIFICATION ------
- PLATE 1.75”THK x 120”W x 370”LG SA 516-70N
- PLATE 1.75”THK x 142”W x 142”LG SA 516-70N

Materials shall, in addition to meeting the requirements of ASTM A 516 70N, satisfy the following criteria and standards:
1. CHEMICAL COMPOSITION
1.1 % Sulphur: 0.003% max (heat and product analysis)
1.2 % Phosphorous: 0.015% max (heat and product analysis)
1.3 CE: 0.43 max
2. MECHANICAL TEST
2.1 Impact test @ -45ºC
2.2 Drop-weight test shall be towards ASTM E 208, and based upon the proposed minimum design temperature, -45ºC
3. Ultrasonic examination as per SA 587-C
4. Magnetic particle examination
5. Parent material and weldment shall comply with the requirements of Clause 7 and SSC Region 2, as shown in Figure 1 of NACE MR0175 / ISO 15156 Part 2. Microhardness shall be maximum 248HV500 (ASTM E 384) and macrohardness maximum 22HRC (ASTM E 18).

6. SSC resistance shall comply with Annex B of NACE MR0175 / ISO 15156, and as follows:
a. Laboratory testing shall satisfy tests for specific sour service application in accordance with Clause B.3 of Annex B.
b. Test requirements shall be in accordance with NACE TM0177, performed at a temperature of 24oC±3oC (75oF±5oF).
c. The test qualification validity shall be in accordance with Table B.1, SSC Region 2, test type FPB, applied stress > ?> 90% AYS, pH of the environment shall be adjusted to 4. FPB test shall be in accordance with Appendix 2 of EFC Publication No. 16, ISO 7539 Part 2. FPB evaluation and acceptance criteria shall meet with the requirements of B.4.2.3, Annex B of NACE MR0175 / ISO 15156 Part 2 for SZC and SOHIC.
d. The test environment shall be,
i. 5% mass fraction NaCl + 0.4% mass fraction CH3COONa.
ii. pH 4, adjusted using HCl or NaOH.
iii. H2S partial pressure 9.7KPa or alternatively 2,300ppm after saturation of the environment.
e. The acceptance criterion is, no cracking.

7. HIC and SWC resistance shall comply with the requirements of B.5 and Table B.3 of Annex B of NACE MR0175 / ISO 15156 Part 2, and as follows:-
a. Testing shall be in accordance with NACE TM0284. Testing temperature shall be 25ºC±3ºC (77ºF±5ºF).
b. The test environment shall be the same as in 6.d above.
c. The acceptance criterion is, no cracking.

 

[grampi1]

David403,

This looks somewhat familiar. It is a very difficult set of specs to meet but is possible. Comments;

Note there is not a lot of Drop Weight Test data for A516-70N so am not sure what you are going to get. Drop Weight requirement also seems excessive if this is for a standard Section VIII Div 1 design. In standard ASME vessel codes, DWT is only found in the Nuclear section.

The HIC requirement is easy as its just ISO.

SOHIC is a gamble and not well known in terms of standard behavior.

Plates may also fail the FPB SSC test at 90% AYS. However, FPB is the most likley to pass of the allowed methods.

Phosphorous allowed is higher than recommended in NACE/ISO MR0175/15156 Part 2 Section 8.

Suspect reference to 248HV500 may be 248HV5 (as in 5KG) 0.5KG goes far beyond NACE/ISO twoard microhardness and have never heard of using 500KG.

Key is to make sure you deal with a top notch plate supplier with a track record of making sour service normalized plate.

Would be intersted in the initials of the Customer organization. If you post your e-mail address, there are some additional suggestions I might be able to pass along.

grampi1

 

[unclesyd]

Several years ago we had some 16 PSA, H2 plant, vessels made from HIC resistant 516 material. The material far exceed our requirements and as I recall it came with a 2 page pedigree with testing quite similar to your requirements.
Again recalling from memory the steel was supplied by Lukens. The link I had is dead so that means that they have been absorbed, probably by ISG/Mittal.
I try to call tomorrow and see if there is more information in the equipment files.

 

[SJones]

Arcelor and Dillinger in Europe will have little problem with the requirements except maybe the DWTT. In vessel codes, DWTT is found in ASME VIII Div 2 Article M3 as a routine test for a number of Q&T steels (not just nuclear).

Steve Jones
Materials & Corrosion Engineer

http://www.pdo.co.om/pdo/

 

[David403]

grampi1, Thank you for your comments.
The material is for the vessel of Slug Catcher. At beginning, customer designed the aluminum hot spry internal coating. Due to new findings with respect to the RFG gas composition, the internal thermal spray of aluminums coating is no longer required. But the materials of the vessel have to meet all these requirements.

Regarding SSC and HIC test, it looks like just copy from NACE standard, but I didn’t hear some one actually did these tests for vessel fabrication. And I can not find any SSC test result for SA 516-70N.

I contacted a supplier who can offer HIC test as per NACE MR0175/ ISO15156-2 ANNEX B, B.5 Criteria: CLR<=15%, CTR<=5%, CSR<=2%. Former LUKENS STEEL HIC-TESTED A516 STEEL sample average: CLR10.0%, CTR3.0%, CSR1.0%. But the test method looks like different from customer’s specification. And I don’t know which one is stricter. That is the reason I am looking for the comments about SSC and HIC test for SA 516-70N.
My e-mail : dshen@maxfield.ca

 

[unclesyd]

You might give these people a call as their material is stated to be HIC tested and meets the requirements of SA 516-70. We used this material to patch some of our original PSA vessels prior to their replacement.

http://www.aasteel.com/tuf37.html

 

[unclesyd]

The steel was supplied by Lukens.

The International Steel Group, Mittal, did acquire the Lukens plate mill. I never delt with ISG so have no idea of their technical service.