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All Thread Rods ASTM A320 Grade L7
Item No.：
B-004
Category：
Summary
We passed the ISO9001:2000 quality management system certification in 2019, and organized and trained an elite team of professional production, inspection, sales and distribution.
Tel: +86-574-86520006
E-mail: info@nbasme.com，sales@nbasme.com
Description
ASTM A320 is a specification for alloy steel and stainless steel bolting for low-temperature service. The term “bolting material” used in this specification includes rolled, forged or strain-hardened rods, bolts, screws, and studs. This specification covers alloy steel bolting for pressure vessels, valves, flanges, and fittings for low-temperature service.
A320 Grade L7 Mechanical Requirements
|
Grade |
Diameter, |
Minimum Tempering Temperature °F |
Tensile Strength, min, ksi [MPa] |
Yield Strength, min, ksi [MPa] (0.2 % offset) |
Elongation in 2 in. or 50 mm min, % |
Reduction of Area, min, % |
Reduction of Area, min, % |
|
|
2-1/2 |
1100 |
125 |
105 |
16 |
50 |
321 HBW or 35 HRC |
A320 Grade L7 Heat Treatment
|
L7 Alloy steel |
AISI 4140/4142 quenched and tempered |
A320 Grade L7 Chemical Requirements (Composition, %)
|
Element |
Carbon |
Manganese |
Phosphorus max |
Sulfur, max |
Silicon |
Nickel |
Chromium |
Molybdenum |
|
L7 |
0.38-0.48 |
0.75-1.00 |
0.035 |
0.040 |
0.15-0.35 |
- |
0.80-1.10 |
0.15-0.25 |
About Us
Our factory is equipped with its own laboratory and has various equipment for product testing. We can provide testing data according to customer requirements.
1.Material tensile strength, product tensile strength, yield, wedge load, elongation, shrinkage
2.Proof load test for bolts and nuts
3.Hardness test
4.Head firmness test
5.Metallographic analysis, decarburization test, carburizing
6.Roughness detection
7.Preload test for checking hydrogen embrittlement - parallel bearing surface method
8.Salt spray test
Online Message
Thank you for your attention to us. If you have any needs or comments,please leave us a message.
SERVICE HOTLINE:
Address：No. 100, Tianshen Road, Tiangu Industrial Zone, Jiulonghu Town, Zhenhai District, Ningbo, Zhejiang, China.
M.T.：+86-18967865853
TEL：+86-574-86520006
E-mail：info@nbasme.com，sales@nbasme.com
+86-18967865853
+86-574-86520006
info@nbasme.com
sales@nbasme.com
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