Aanuraj Fasteners Pvt Ltd. Type 304 stainless fasteners offers corrosion resistance. Lesser to type 316 stainless due to the added molybdenum.
Grade B8 Class 1 fasteners require carbide solution treatment,
Class 2 fasteners require an additional strain hardening operation which increases the strength and reduces the susceptibility to galling.
Class 2 fasteners are marked “RAJ B8” with the grade symbol underlined.
ASTM A193 GR.B8 STANDARD PDF DOWNLOAD
Standards |
ASTM A320 Gr.B8 / ASTM A320 Gr.B8M |
CLASS: |
CL.1/CL.2 |
MOC: |
SS 304 / SS 316 |
Dimensions: |
ASME B18.2.1 , ASME B18.3 |
THREADS INCHES: |
ASME B1.1 2A/3A Unified Threads |
THREADS METRICS: |
B1.13M 6h Coarse Threads |
Additional Requirements: |
NACE MR0103/MR0175/ ISO 15156 Compliance |
Mandatory Requirements: |
Free from Mercury & Radioactive Contamination |
Chemical elements % @ AISI 304
ChemicalElements |
Min.% |
Max.% |
Product Variationover or Under |
Carbon C% |
0.08 |
0.01 over |
|
Manganese Mn |
2.00 |
0.04 over |
|
Phosphorus |
0.045 |
0.010 over |
|
Sulfur |
0.030 |
0.005 over |
|
Silicon |
1.00 |
0.05 over |
|
Nickel |
8.0 |
10.50 |
0.15 |
Chromium |
18.0 |
20.00 |
0.20 |
Mechanical Properties: Metric Products:
MechanicalElements |
Tensile Strength Min MPA |
Yield Strength Min MPA |
Elongation Min% |
Reduction Min% |
Hardness Max |
|
ASTM A320 GRADE B8 CL.1 |
||||||
75 [515] |
30 [205] |
30 |
50 |
96 HRB |
||
ASTM A 320 GRADE B8 CL.2 |
||||||
M20 and under |
125 [860] |
100[690] |
12 |
35 |
35 HRC |
|
M20 to M25 |
115[795] |
80[550] |
15 |
30 |
35 HRC |
|
M25 to M32 |
105[725] |
65[450] |
20 |
35 |
35 HRC |
|
M32 to M40 |
100[690] |
50[345] |
28 |
45 |
35 HRC |
|
—————————————————————————————————————————————————————————————————————-
Chemical elements % @ AISI 316
ChemicalElements |
Min.% |
Max.% |
Product Variationover or Under |
Carbon C% |
0.08 |
0.01 over |
|
Manganese Mn |
2.00 |
0.04 over |
|
Phosphorus |
0.045 |
0.010 over |
|
Sulfur |
0.030 |
0.005 over |
|
Silicon |
1.00 |
0.05 over |
|
Nickel |
10.00 |
14.00 |
0.15 |
Chromium |
16.0 |
18.00 |
0.20 |
Molybdenum |
2.00 |
3.00 |
0.10 |
Mechanical Properties: Metric Products:
MechanicalElements |
Tensile Strength Min MPA |
Yield Strength Min MPA |
Elongation Min% |
Reduction Min% |
Hardness Max |
|
ASTM A320 GRADE B8M CL.1 |
||||||
75 [515] |
30 [205] |
30 |
50 |
96 HRB |
||
ASTM A 320 GRADE B8M CL.2 |
||||||
M20 and under |
110 [760] |
95 [665] |
15 |
45 |
35 HRC |
|
M20 to M24 |
100[690] |
80[550] |
20 |
45 |
35 HRC |
|
M24 to M32 |
95[655] |
65[450] |
25 |
45 |
35 HRC |
|
M32 to M40 |
90[620] |
50[345] |
30 |
45 |
35 HRC |
|
P.N.: Annealing Process:
ANNEALING TEMPERATURE |
HOURS |
QUENCHING MEDIA |
140 TO 150 |
RUNNING |
|
1050°c |
MINUTES |
WATER |