Corpus sync: neutrality remakes, note hygiene, datasheet relocation, transformer-split cross-refs
---
title: Metal Fabrications
…268 unchanged lines
```
−# Materials {toc}
+# Carbon Steel {toc}
−## Carbon Steel {toc}
+## Carbon steel is the default material for most fabricated elements because it is economical, weldable, and accepts galvanizing and coatings well. Grade 50 low-alloy steel is selected where a slender exposed profile demands a thinner section than mild steel allows. {note}
−### Carbon steel is the default material for most fabricated elements because it is economical, weldable, and accepts galvanizing and coatings well. Grade 50 low-alloy steel is selected where a slender exposed profile demands a thinner section than mild steel allows. {note}
+## Carbon steel plate, bar, and shapes shall conform to ASTM A36 (Fy = 36 ksi) except where a higher strength is required, in which case ASTM A572 Grade 50 (Fy = 50 ksi) shall be used.
−### Carbon steel plate, bar, and shapes shall conform to ASTM A36 (Fy = 36 ksi) except where a higher strength is required, in which case ASTM A572 Grade 50 (Fy = 50 ksi) shall be used.
+## Hollow structural sections (tube) shall conform to ASTM A500 Grade C.
−### Hollow structural sections (tube) shall conform to ASTM A500 Grade C.
+## Steel pipe shall conform to ASTM A53 Grade B.
−### Steel pipe shall conform to ASTM A53 Grade B.
−
```datasheet
label: Carbon steel plate, bar, and shape grade
type: radio
options:
− - "ASTM A36 - Fy = 36 ksi (default)"
+ - "ASTM A36 - Fy = 36 ksi"
- "ASTM A572 Gr 50 - Fy = 50 ksi (slender exposed profiles)"
−default: "ASTM A36 - Fy = 36 ksi (default)"
+default: "ASTM A36 - Fy = 36 ksi"
```
…7 unchanged lines
```
−## Stainless Steel {toc}
+# Stainless Steel {toc}
−### Stainless steel is selected where a bare metallic finish is the architectural intent or where corrosion resistance without a coating is required. The alloy choice is an exposure decision, not an aesthetic one. {note}
+## Stainless steel is selected where a bare metallic finish is the architectural intent or where corrosion resistance without a coating is required. The alloy choice is an exposure decision, not an aesthetic one. {note}
−### Stainless steel plate and sheet shall conform to ASTM A240, and bars and shapes shall conform to ASTM A276, in the alloy required for the exposure.
+## Stainless steel plate and sheet shall conform to ASTM A240, and bars and shapes shall conform to ASTM A276, in the alloy required for the exposure.
```datasheet
…6 unchanged lines
```
−## Aluminum {toc}
+# Aluminum {toc}
−### Aluminum is the standard material for sunshade and brise-soleil blades and for lightweight architectural trim, because extrusions give crisp profiles at low weight and accept high-durability factory coatings. Alloy 6063-T5 is the architectural default; 6061-T6 is used where higher strength is needed. {note}
+## Aluminum is the standard material for sunshade and brise-soleil blades and for lightweight architectural trim, because extrusions give crisp profiles at low weight and accept high-durability factory coatings. Alloy 6063-T5 is the architectural default; 6061-T6 is used where higher strength is needed. {note}
−### Aluminum extrusions shall conform to ASTM B221, and aluminum sheet and plate shall conform to ASTM B209.
+## Aluminum extrusions shall conform to ASTM B221, and aluminum sheet and plate shall conform to ASTM B209.
```datasheet
…6 unchanged lines
```
−## Galvanic Isolation {toc}
+# Galvanic Isolation {toc}
−### Aluminum in direct contact with steel forms a galvanic couple that corrodes the aluminum in the presence of moisture. Sunshade blades and arms attached to steel supports are a classic failure: the aluminum sacrifices itself at the joint and the connection loosens and stains. Isolation at the interface is mandatory, not optional. {note}
+## Aluminum in direct contact with steel forms a galvanic couple that corrodes the aluminum in the presence of moisture. Sunshade blades and arms attached to steel supports are a classic failure: the aluminum sacrifices itself at the joint and the connection loosens and stains. Isolation at the interface is mandatory, not optional. {note}
−### Dissimilar-metal connections between aluminum and steel shall be isolated with a non-absorptive neoprene or EPDM gasket or an equivalent dielectric barrier at the faying surfaces.
+## Dissimilar-metal connections between aluminum and steel shall be isolated with a non-absorptive neoprene or EPDM gasket or an equivalent dielectric barrier at the faying surfaces.
−### Fasteners at dissimilar-metal connections shall be stainless steel.
+## Fasteners at dissimilar-metal connections shall be stainless steel.
# Fabrication {toc}
…240 unchanged lines
type: radio
options:
− - "Grade 36 (default)"
+ - "Grade 36"
- "Grade 55"
- "Grade 105 (high uplift / seismic)"
−default: "Grade 36 (default)"
+default: "Grade 36"
```
…208 unchanged lines
- Matched touch-up coating for each finish
```