Name: ASTM A403 WP304 Stainless Steel Fitting Elbow Buttwelded Seamless B16.9
Brand: Yuhong Group Co.,Ltd
SKU: ASTM A403 WP304
Price: 100000.00 USD
Availability: InStock

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ASTM A403 WP304 Stainless Steel Fitting Elbow Buttwelded Seamless B16.9

Product Details:

Place of Origin:	CHINA
Brand Name:	YUHONG
Certification:	ABS, GL, DNV, NK, PED, AD2000, GOST9941-81, CCS, ISO 9001-2015
Model Number:	ASTM A403 WP304

Payment & Shipping Terms:

Minimum Order Quantity:	1PCS
Price:	Negotiable
Packaging Details:	Wooden Case
Delivery Time:	7DAYS
Payment Terms:	L/C,T/T

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Detailed Product Description

Standard:	ASTM A403	Material:	WP304
NDT:	HT/PT/RT	Packing:	Wooden Case
Application:	Boiler System/Petrochemical/Electric Power/Marine Engineering
Highlight:	ASTM A403 stainless steel elbow , WP304 90° elbow fitting , B16.9 stainless steel fitting

ASTM A403 WP304 Stainless Steel Fitting Elbow Buttwelded Seamless B16.9

ASTM A403 WP304 stainless steel fittings are one of the most widely used austenitic stainless steel fittings. The ASTM A403 standard specifies strict requirements for chemical composition, mechanical properties, heat treatment, dimensional tolerances, non-destructive testing and marking for wrought butt-weld, socket-weld and threaded fittings manufactured from UNS S30400.

Fitting Classes for WP Grades

Class	Construction	Nondestructive Examination
S	Seamless	None
W	Welded	Radiography or Ultrasonic
WX	Welded	Radiography
WU	Welded	Ultrasonic

ASTM A403 WP304 Stainless Steel Chemical Composition

GRA.

UNS

GRA.

CHEMICAL COMPOSITION %

WP304

S30400

0.08

2.00

0.045

0.030

1.00

8.0-11.0

18.0-20.0

WP304L

S30406

0.035

2.00

0.045

0.030

1.00

8.0-12.0

18.0-20.0

What is the difference between WP304 and WP304L?

The core difference between WP304 and WP304L lies in their carbon content. WP304 has a standard upper limit of 0.08%, while WP304L has a strictly limited upper limit of 0.030%. The "L" stands for Low Carbon, an ultra-low carbon version of 304 stainless steel. This difference in carbon content primarily affects the intergranular corrosion resistance and weldability of WP304 and WP304L.

Intergranular corrosion occurs when 304 stainless steel is exposed to the sensitive temperature range of 425°C to 850°C. Carbon combines with chromium to form chromium carbides, which precipitate at grain boundaries. This significantly reduces the chromium content near the grain boundaries, creating "chromium depletion." Corrosive media preferentially attack these depleted areas, leading to cracking along the grain boundaries.

This makes WP304 highly carbon-sensitive, while the ultra-low carbon design of WP304L can significantly reduce the amount of chromium carbide precipitation. At the same time, without the need for post-weld heat treatment, WP304L still maintains excellent intergranular corrosion resistance, thus eliminating the need for post-weld heat treatment and significantly saving cost and time.

ASTM A403 WP304 Stainless Steel Fitting Heat Treatment