ASTM A325结构螺栓的标准与规范

2025-12-02 12:27:13

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ASTM A325结构螺栓标准规范，钢材，热处理

ASTM A325 正式被撤销，并被 ASTM F3125 所取代。A325 现已成为一项规范。F3125 规范是对六项 ASTM 标准(包括 A2280)的整合与替代。我们选择保留有关现已过时的A325 规范的技术信息，仅供信息参考之用。在 2016 年退出市场之前，ASTM A325 规范涵盖了从直径 1/2 英寸至直径 1-1/2 英寸的高强度重型六角结构螺栓。这些螺栓适用于结构连接领域，因此其螺纹长度比标准六角螺栓要短，本规范仅适用于重型六角结构螺栓。

A325 Types

TYPE 1	Medium carbon, carbon boron, or medium carbon alloy steel.
TYPE 2	Withdrawn November 1991.
TYPE 3	Weathering steel.
T	Fully threaded A325.(Restricted to 4 times the diameter in length)
M	Metric A325.

A325 Connection Types

SC	Slip critical connection.
N	Bearing type connection with threads included in the shear plane.
X	Bearing-type connection with threads excluded from the shear plane.

A325 Mechanical Properties

Heat Analysis	120ksi, %	150ksi, %
Carbon	0.30 – 0.52	0.30 – 0.48*
Manganese	0.60 min	0.60 min
Phosphorus	0.035 max	0.035 max
Sulfur	0.040 max	0.040 max
Silicon	0.15 – 0.30	-
Boron	0.003 max	0.003 max
Copper	-	-
Nickel	-	-
Chromium	-	-
Molybdenum	-	-
*Carbon 0.35-0.53% for 1-1/2” A490/150ksi bolts

A325 Type 3 Chemical Properties

Heat Analysis	120ksi, % Comp A	120ksi, % Comp B	120ksi, % Index	150ksi, % Index
Carbon	0.33 – 0.40	0.38 – 0.48	0.30 – 0.52	0.30 – 0.53
Manganese	0.90 – 1.20	0.70 – 0.90	0.60 min	0.60 min
Phosphorus	0.035 max	0.035 max	0.035 max	0.035 max
Sulfur	0.040 max	0.040 max	0.040 max	0.040 max
Silicon	0.15 – 0.30	0.30 – 0.50
Copper	0.25 – 0.45	0.20 – 0.40	0.20 – 0.60	0.20 – 0.60
Nickel	0.25 – 0.45	0.50 – 0.80	0.20 min*	0.20 min*
Chromium	0.45 – 0.65	0.50 – 0.80	0.20 min	0.20 min
Molybdenum		0.06 max	0.10 min*	0.10 min*
Either Nickel or Molybdenum must be present in the amount specified Corrosion Index based on ASTM Guide G101

A325 Recommended Hardware

Nuts			Washers
Type 1		Type 3	Type 1	Type 3
Plain	Galvanized	Plain
A563C, C3, D, DH, DH3	A563DH	A563C3, DH3	F436-1	F436-3
Note: Nuts conforming to A194 Grade 2H are a suitable substitute for use with A325 heavy hex structural bolts. The ASTM A563 Nut Compatibility Chart has a complete list of specifications.