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ASTM A193 B7M and ASTM A320 L7M Stud Bolts

There has been much concern among users trying to know the difference betweem B7M and L7M materials.  These materials are highly popular when they require the bolts and nuts to be compliant with NACE 0175. Popular with Xylan coating, these bolts are highly called for in Singapore, Malaysia, Thailand, Vietnam.

ASTM A193 B7M, being under the A193 standards, fall under the Standard Specification for Alloy Steel and Stainless Steel Bolting for High Temperature or High Pressure Service and Other Special Purpose Application

ASTM A320 L7M, being under the A320 standards, fall under the Standard Specification for Alloy Steel and Stainless Steel Bolting for Low Temperature Service

This different temperature service services to differentiate B7M from L7M material.  Clients should be aware of the operating conditions before they make their requests for B7M and L7M bolts.  A misuse may lead to potentially big problems.

To enhance corrosion resistance, bolts and nuts can be coated with Xylan coat, zinc plating, cadmium plating and hot dipped galvanizing.

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A193 B7 in Singapore Malaysia Thailand

There has been an increasing trend in Singapore, Malaysia and Thailand for bolts and nuts manufactured to ASTM A193 B7 standards.  This is due to the increasing jobs secured in Singapore Malaysia and Thailand in the Oil and Gas sector. More importantly, A193 B7 has been recognized as one of the most basic and important bolting materials used due to its high tensile properties with its additional performance due to the presence of Chromium and Molybdenum.  Quite often, the ASTM A193 B7 stud bolts in Singapore Malaysia and Thailand have additional coatings, whether it is Hot Dipped Galvanized or Xylan.

While A193 B7 remainds a popular material grade in Singapore Malaysia and Thailand, we also see a general increasing trend for more exotic and special materials.  This includes the use of A453 660 , UNS 32760 , ASTM A193 B8M and ASTM A320 L7M .